diff --git a/build.sbt b/build.sbt
index 2146b44..c33f138 100644
--- a/build.sbt
+++ b/build.sbt
@@ -55,6 +55,7 @@ lazy val root = (project in file("."))
 				"-source", "17",
 				"-target", "17"
 			),
+			autoAPIMappings := true,
 			
 			assemblyMergeStrategy := {
 				case module if module endsWith "module-info.class" => MergeStrategy.concat
diff --git a/project/MornyConfiguration.scala b/project/MornyConfiguration.scala
index 392e91a..bdfd34d 100644
--- a/project/MornyConfiguration.scala
+++ b/project/MornyConfiguration.scala
@@ -8,7 +8,7 @@ object MornyConfiguration {
 	val MORNY_CODE_STORE = "https://github.com/Eyre-S/Coeur-Morny-Cono"
 	val MORNY_COMMIT_PATH = "https://github.com/Eyre-S/Coeur-Morny-Cono/commit/%s"
 	
-	val VERSION = "2.0.0-alpha1.1"
+	val VERSION = "2.0.0-alpha2"
 	val VERSION_DELTA: Option[String] = None
 	val CODENAME = "guanggu"
 	
@@ -42,6 +42,9 @@ object MornyConfiguration {
 		
 		"org.scalatest" %% "scalatest" % "3.2.17" % Test,
 		"org.scalatest" %% "scalatest-freespec" % "3.2.17" % Test,
+		// for test report
+		"com.vladsch.flexmark" % "flexmark" % "0.64.0" % Test,
+		"com.vladsch.flexmark" % "flexmark-profile-pegdown" % "0.64.0" % Test
 		
 	)
 	
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/command/DirectMsgClear.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/command/DirectMsgClear.scala
index 032482b..cb49df2 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/command/DirectMsgClear.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/command/DirectMsgClear.scala
@@ -13,7 +13,7 @@ import scala.language.postfixOps
 class DirectMsgClear (using coeur: MornyCoeur) extends ISimpleCommand {
 	
 	override val name: String = "r"
-	override val aliases: Array[ICommandAlias] | Null = null
+	override val aliases: List[ICommandAlias] = Nil
 	
 	override def execute (using command: InputCommand, event: Update): Unit = {
 		
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/command/Encryptor.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/command/Encryptor.scala
index 080466e..243f62c 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/command/Encryptor.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/command/Encryptor.scala
@@ -22,7 +22,7 @@ import scala.language.postfixOps
 class Encryptor (using coeur: MornyCoeur) extends ITelegramCommand {
 	
 	override val name: String = "encrypt"
-	override val aliases: Array[ICommandAlias] | Null = Array(ListedAlias("enc"))
+	override val aliases: List[ICommandAlias] = ListedAlias("enc") :: Nil
 	override val paramRule: String = "[algorithm|(l)] [(uppercase)]"
 	override val description: String = "通过指定算法加密回复的内容 (目前只支持文本)"
 	
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/command/EventHack.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/command/EventHack.scala
index 03211e8..0cc63fc 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/command/EventHack.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/command/EventHack.scala
@@ -11,7 +11,7 @@ import scala.language.postfixOps
 class EventHack (using coeur: MornyCoeur) extends ITelegramCommand {
 	
 	override val name: String = "event_hack"
-	override val aliases: Array[ICommandAlias] | Null = null
+	override val aliases: List[ICommandAlias] = Nil
 	override val paramRule: String = "[(user|group|any)]"
 	override val description: String = "输出 bot 下一个获取到的事件序列化数据"
 	
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/command/GetSocial.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/command/GetSocial.scala
index f8bfc58..b69c49d 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/command/GetSocial.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/command/GetSocial.scala
@@ -10,7 +10,7 @@ import com.pengrad.telegrambot.request.SendSticker
 class GetSocial (using coeur: MornyCoeur) extends ITelegramCommand {
 	
 	override val name: String = "get"
-	override val aliases: Array[ICommandAlias] | Null = null
+	override val aliases: List[ICommandAlias] = Nil
 	override val paramRule: String = "<tweet-url|weibo-status-url>"
 	override val description: String = "从社交媒体分享链接获取其内容"
 	
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/command/GetUsernameAndId.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/command/GetUsernameAndId.scala
index a960c07..4e2c435 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/command/GetUsernameAndId.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/command/GetUsernameAndId.scala
@@ -13,7 +13,7 @@ import scala.language.postfixOps
 class GetUsernameAndId (using coeur: MornyCoeur) extends ITelegramCommand {
 	
 	override val name: String = "user"
-	override val aliases: Array[ICommandAlias] | Null = null
+	override val aliases: List[ICommandAlias] = Nil
 	override val paramRule: String = "[userid]"
 	override val description: String = "获取指定或回复的用户相关信息"
 	
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/command/IP186Query.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/command/IP186Query.scala
index 2b5795d..47a3fe7 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/command/IP186Query.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/command/IP186Query.scala
@@ -18,13 +18,13 @@ class IP186Query (using coeur: MornyCoeur) {
 	
 	object IP extends ITelegramCommand:
 		override val name: String = "ip"
-		override val aliases: Array[ICommandAlias]|Null = null
+		override val aliases: List[ICommandAlias] = Nil
 		override val paramRule: String = "[ip]"
 		override val description: String = "通过 https://ip.186526.xyz 查询 ip 资料"
 		override def execute (using command: InputCommand, event: Update): Unit = query
 	object Whois extends ITelegramCommand:
 		override val name: String = "whois"
-		override val aliases: Array[ICommandAlias]|Null = null
+		override val aliases: List[ICommandAlias] = Nil
 		override val paramRule: String = "[domain]"
 		override val description: String = "通过 https://ip.186526.xyz 查询域名资料"
 		override def execute (using command: InputCommand, event: Update): Unit = query
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/command/ISimpleCommand.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/command/ISimpleCommand.scala
index 24c624f..dcd5d91 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/command/ISimpleCommand.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/command/ISimpleCommand.scala
@@ -25,9 +25,9 @@ trait ISimpleCommand {
 	  * the unique identifier, it uses the same namespace with [[name]], means
 	  * it also cannot be duplicate with other [[name]] or [[aliases]].
 	  *
-	  * It can be [[Null]], means no aliases.
+	  * It should not be [[Null]], using [[Nil]] instead for no aliases.
 	  */
-	val aliases: Array[ICommandAlias]|Null
+	val aliases: List[ICommandAlias]
 	
 	/** The work code of this command.
 	  *
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyCommands.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyCommands.scala
index d46b48a..3f44ff2 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyCommands.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyCommands.scala
@@ -19,7 +19,7 @@ class MornyCommands (using coeur: MornyCoeur) {
 		val stash = mutable.SeqMap.empty[String, ISimpleCommand]
 		for (i <- commands)
 			stash += (i.name -> i)
-			if (i.aliases ne null) for (alias <- i.aliases)
+			for (alias <- i.aliases)
 				stash += (alias.name -> i)
 		stash
 	
@@ -122,7 +122,7 @@ class MornyCommands (using coeur: MornyCoeur) {
 			BotCommand(name, if paramRule isBlank then intro else s"$paramRule - $intro")
 		val list = mutable.ArrayBuffer[BotCommand](
 			buildOne(command.name, command.paramRule, command.description))
-		if (command.aliases ne null) for (alias <- command.aliases)
+		for (alias <- command.aliases)
 			if (alias.listed) list += buildOne(alias.name, "", "↑")
 		list toArray
 	
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyHellos.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyHellos.scala
index 34d8943..ebf5518 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyHellos.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyHellos.scala
@@ -14,7 +14,7 @@ class MornyHellos (using coeur: MornyCoeur) {
 	object On extends ITelegramCommand {
 		
 		override val name: String = "on"
-		override val aliases: Array[ICommandAlias] | Null = null
+		override val aliases: List[ICommandAlias] = Nil
 		override val paramRule: String = ""
 		override val description: String = "检查是否在线"
 		
@@ -29,7 +29,7 @@ class MornyHellos (using coeur: MornyCoeur) {
 	object Hello extends ITelegramCommand {
 		
 		override val name: String = "hello"
-		override val aliases: Array[ICommandAlias] | Null = Array(ListedAlias("hi"))
+		override val aliases: List[ICommandAlias] = ListedAlias("hi") :: Nil
 		override val paramRule: String = ""
 		override val description: String = "打招呼"
 		
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyInfoOnStart.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyInfoOnStart.scala
index db0bd7e..c9f55e2 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyInfoOnStart.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyInfoOnStart.scala
@@ -13,7 +13,7 @@ import scala.language.postfixOps
 class MornyInfoOnStart (using coeur: MornyCoeur) extends ISimpleCommand {
 	
 	override val name: String = "start"
-	override val aliases: Array[ICommandAlias] | Null = null
+	override val aliases: List[ICommandAlias] = Nil
 	
 	override def execute (using command: InputCommand, event: Update): Unit = {
 		
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyInformation.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyInformation.scala
index c331c1c..fb683ad 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyInformation.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyInformation.scala
@@ -27,7 +27,7 @@ class MornyInformation (using coeur: MornyCoeur) extends ITelegramCommand {
 	}
 	
 	override val name: String = "info"
-	override val aliases: Array[ICommandAlias]|Null = null
+	override val aliases: List[ICommandAlias] = Nil
 	override val paramRule: String = "[(version|runtime|stickers[.IDs]|tasks|event)]"
 	override val description: String = "输出当前 Morny 的各种信息"
 	
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyInformationOlds.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyInformationOlds.scala
index 60f94ec..3521b6e 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyInformationOlds.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyInformationOlds.scala
@@ -7,12 +7,12 @@ class MornyInformationOlds (using base: MornyInformation) {
 	
 	object Version extends ISimpleCommand:
 		override val name: String = "version"
-		override val aliases: Array[ICommandAlias] | Null = null
+		override val aliases: List[ICommandAlias] = Nil
 		override def execute (using command: InputCommand, event: Update): Unit = base.echoVersion
 	
 	object Runtime extends ISimpleCommand:
 		override val name: String = "runtime"
-		override val aliases: Array[ICommandAlias] | Null = null
+		override val aliases: List[ICommandAlias] = Nil
 		override def execute (using command: InputCommand, event: Update): Unit = base.echoRuntime
 	
 }
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyManagers.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyManagers.scala
index aea4127..2dc8f60 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyManagers.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyManagers.scala
@@ -17,7 +17,7 @@ class MornyManagers (using coeur: MornyCoeur) {
 	object Exit extends ITelegramCommand {
 		
 		override val name: String = "exit"
-		override val aliases: Array[ICommandAlias] | Null = Array(HiddenAlias("stop"), HiddenAlias("quit"))
+		override val aliases: List[ICommandAlias] = HiddenAlias("stop") :: HiddenAlias("quit") :: Nil
 		override val paramRule: String = "exit"
 		override val description: String = "关闭 Bot （仅可信成员）"
 		
@@ -52,7 +52,7 @@ class MornyManagers (using coeur: MornyCoeur) {
 	object SaveData extends ITelegramCommand {
 		
 		override val name: String = "save"
-		override val aliases: Array[ICommandAlias] | Null = null
+		override val aliases: List[ICommandAlias] = Nil
 		override val paramRule: String = ""
 		override val description: String = "保存缓存数据到文件（仅可信成员）"
 		
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyOldJrrp.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyOldJrrp.scala
index 2d44bff..7e09ef4 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyOldJrrp.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/command/MornyOldJrrp.scala
@@ -11,7 +11,7 @@ import com.pengrad.telegrambot.request.SendMessage
 class MornyOldJrrp (using coeur: MornyCoeur) extends ITelegramCommand {
 	
 	override val name: String = "jrrp"
-	override val aliases: Array[ICommandAlias] | Null = null
+	override val aliases: List[ICommandAlias] = Nil
 	override val paramRule: String = ""
 	override val description: String = "获取 (假的) jrrp"
 	
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/command/Nbnhhsh.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/command/Nbnhhsh.scala
index c05714b..f988b6a 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/command/Nbnhhsh.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/command/Nbnhhsh.scala
@@ -21,7 +21,7 @@ class Nbnhhsh (using coeur: MornyCoeur) extends ITelegramCommand {
 		"<a href=\"https://lab.magiconch.com/nbnhhsh/\">## Result of nbnhhsh query :</a>"
 	
 	override val name: String = "nbnhhsh"
-	override val aliases: Array[ICommandAlias]|Null = null
+	override val aliases: List[ICommandAlias] = Nil
 	override val paramRule: String = "[text]"
 	override val description: String = "检索文本内 nbnhhsh 词条"
 	
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/command/Testing.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/command/Testing.scala
index 949fa83..1ea3b6a 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/command/Testing.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/command/Testing.scala
@@ -12,7 +12,7 @@ import scala.language.postfixOps
 class Testing (using coeur: MornyCoeur) extends ISimpleCommand {
 	
 	override val name: String = "test"
-	override val aliases: Array[ICommandAlias] | Null = null
+	override val aliases: List[ICommandAlias] = Nil
 	
 	override def execute (using command: InputCommand, event: Update): Unit = {
 		
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/command/创.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/command/创.scala
index f2a523e..d32c87a 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/command/创.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/command/创.scala
@@ -1,11 +1,10 @@
 package cc.sukazyo.cono.morny.bot.command
 
 import cc.sukazyo.cono.morny.MornyCoeur
-import cc.sukazyo.cono.morny.data.TelegramStickers
 import cc.sukazyo.cono.morny.util.tgapi.InputCommand
 import cc.sukazyo.cono.morny.util.tgapi.TelegramExtensions.Bot.*
 import com.pengrad.telegrambot.model.{MessageEntity, Update}
-import com.pengrad.telegrambot.request.{SendMessage, SendSticker}
+import com.pengrad.telegrambot.request.SendMessage
 
 //noinspection NonAsciiCharacters
 class 创 (using coeur: MornyCoeur) {
@@ -13,7 +12,7 @@ class 创 (using coeur: MornyCoeur) {
 	object Chuang extends ISimpleCommand {
 		
 		override val name: String = "chuang"
-		override val aliases: Array[ICommandAlias] | Null = null
+		override val aliases: List[ICommandAlias] = Nil
 		
 		override def execute (using command: InputCommand, event: Update): Unit = {
 			
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/command/喵呜.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/command/喵呜.scala
index 996ab79..9c877f7 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/command/喵呜.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/command/喵呜.scala
@@ -17,35 +17,35 @@ class 喵呜 (using coeur: MornyCoeur) {
 	
 	object 抱抱 extends ISimpleCommand {
 		override val name: String = "抱抱"
-		override val aliases: Array[ICommandAlias]|Null = null
+		override val aliases: List[ICommandAlias] = Nil
 		override def execute (using command: InputCommand, event: Update): Unit =
 			replyingSet("贴贴", "贴贴")
 	}
 	
 	object 揉揉 extends ISimpleCommand {
 		override val name: String = "揉揉"
-		override val aliases: Array[ICommandAlias]|Null = null
+		override val aliases: List[ICommandAlias] = Nil
 		override def execute (using command: InputCommand, event: Update): Unit =
 			replyingSet("蹭蹭", "摸摸")
 	}
 	
 	object 蹭蹭 extends ISimpleCommand {
 		override val name: String = "蹭蹭"
-		override val aliases: Array[ICommandAlias]|Null = null
+		override val aliases: List[ICommandAlias] = Nil
 		override def execute (using command: InputCommand, event: Update): Unit =
 			replyingSet("揉揉", "蹭蹭")
 	}
 	
 	object 贴贴 extends ISimpleCommand {
 		override val name: String = "贴贴"
-		override val aliases: Array[ICommandAlias]|Null = null
+		override val aliases: List[ICommandAlias] = Nil
 		override def execute (using command: InputCommand, event: Update): Unit =
 			replyingSet("贴贴", "贴贴")
 	}
 	
 	object Progynova extends ITelegramCommand {
 		override val name: String = "install"
-		override val aliases: Array[ICommandAlias]|Null = null
+		override val aliases: List[ICommandAlias] = Nil
 		override val paramRule: String = ""
 		override val description: String = "抽取一个神秘盒子"
 		override def execute (using command: InputCommand, event: Update): Unit = {
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/command/私わね.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/command/私わね.scala
index 0980f68..52cd803 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/command/私わね.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/command/私わね.scala
@@ -12,7 +12,7 @@ import com.pengrad.telegrambot.request.SendMessage
 class 私わね (using coeur: MornyCoeur) extends ISimpleCommand {
 	
 	override val name: String = "me"
-	override val aliases: Array[ICommandAlias] | Null = null
+	override val aliases: List[ICommandAlias] = Nil
 	
 	override def execute (using command: InputCommand, event: Update): Unit = {