diff --git a/adapters/lark/src/http.ts b/adapters/lark/src/http.ts
index a2e5918a..fa9e2c6b 100644
--- a/adapters/lark/src/http.ts
+++ b/adapters/lark/src/http.ts
@@ -72,10 +72,10 @@ export class HttpServer<C extends Context = Context> extends Adapter<C, LarkBot<
 
       // dispatch message
       bot.logger.debug('received decryped event: %o', body)
-      // @TODO: need await?
       this.dispatchSession(body)
 
       // Lark requires 200 OK response to make sure event is received
+      ctx.body = {}
       return ctx.status = 200
     })
 
diff --git a/adapters/lark/src/message.ts b/adapters/lark/src/message.ts
index 9939397b..0ebbf24d 100644
--- a/adapters/lark/src/message.ts
+++ b/adapters/lark/src/message.ts
@@ -1,14 +1,14 @@
 import { Context, h, MessageEncoder } from '@satorijs/core'
 import { LarkBot } from './bot'
-import { BaseResponse, Lark, MessageComponent } from './types'
+import { BaseResponse, Lark, MessageContent } from './types'
 import { extractIdType } from './utils'
 
 export class LarkMessageEncoder<C extends Context = Context> extends MessageEncoder<C, LarkBot<C>> {
   private quote: string | undefined
   private textContent = ''
-  private richContent: MessageComponent.RichText.Paragraph[] = []
-  private cardElements: MessageComponent.Card.Element[] | undefined
-  private actionElements: MessageComponent.Card.ActionElement[] = []
+  private richContent: MessageContent.RichText.Paragraph[] = []
+  private cardElements: MessageContent.Card.Element[] | undefined
+  private actionElements: MessageContent.Card.ButtonElement[] = []
 
   async post(data?: any) {
     try {
@@ -67,7 +67,11 @@ export class LarkMessageEncoder<C extends Context = Context> extends MessageEnco
     } else {
       await this.post({
         msg_type: 'post',
-        content: JSON.stringify({ zh_cn: this.richContent }),
+        content: JSON.stringify({
+          zh_cn: {
+            content: this.richContent,
+          },
+        }),
       })
     }
 
@@ -161,7 +165,7 @@ export class LarkMessageEncoder<C extends Context = Context> extends MessageEnco
       this.cardElements?.push({ tag: 'hr' })
     } else if (type === 'button') {
       this.flushText()
-      const behaviors: MessageComponent.Card.ActionBehavior[] = []
+      const behaviors: MessageContent.Card.ActionBehavior[] = []
       if (attrs.type === 'link') {
         behaviors.push({
           type: 'open_url',
diff --git a/adapters/lark/src/types/message/content.ts b/adapters/lark/src/types/message/content.ts
index 024065e2..5f4d4fa7 100644
--- a/adapters/lark/src/types/message/content.ts
+++ b/adapters/lark/src/types/message/content.ts
@@ -16,7 +16,20 @@ declare global {
   }
 }
 
-export namespace MessageComponent {
+export interface MessageContent {
+  text: MessageContent.Text
+  post: MessageContent.RichText
+  image: MessageContent.Image
+  file: MessageContent.File
+  audio: MessageContent.Audio
+  media: MessageContent.Media
+  sticker: MessageContent.Sticker
+  share_chat: MessageContent.ShareChat
+  share_user: MessageContent.ShareUser
+  system: MessageContent.System
+}
+
+export namespace MessageContent {
   export interface Text {
     text: string
   }
@@ -115,7 +128,7 @@ export namespace MessageComponent {
       text: string
     }
 
-    export interface HorizontalRuleElement extends BaseElement<'hr'> {}
+    export interface HRElement extends BaseElement<'hr'> {}
 
     export interface MarkdownElement extends BaseElement<'md'> {
       text: string
@@ -132,7 +145,7 @@ export namespace MessageComponent {
       | ImageElement
       | MediaElement
       | CodeBlockElement
-      | HorizontalRuleElement
+      | HRElement
 
     export type Paragraph =
       | InlineElement[]
diff --git a/adapters/lark/src/types/message/index.ts b/adapters/lark/src/types/message/index.ts
index 6bbc3cb2..4cedc97f 100644
--- a/adapters/lark/src/types/message/index.ts
+++ b/adapters/lark/src/types/message/index.ts
@@ -1,24 +1,7 @@
-import { Lark } from '..'
-import { MessageComponent } from './content'
+import { Lark, MessageContent } from '..'
 
 export * from './content'
 
-export type MessageType = 'text' | 'post' | 'image' | 'file' | 'audio' | 'media' | 'sticker' | 'interactive' | 'share_chat' | 'share_user'
-
-export interface MessageContentMap {
-  'text': MessageComponent.Text
-  'post': MessageComponent.RichText
-  'image': MessageComponent.Image
-  'file': MessageComponent.File
-  'audio': MessageComponent.Audio
-  'media': MessageComponent.Media
-  'sticker': MessageComponent.Sticker
-  'share_chat': MessageComponent.ShareChat
-  'share_user': MessageComponent.ShareUser
-}
-
-export type MessageContentType<T extends MessageType> = T extends keyof MessageContentMap ? MessageContentMap[T] : any
-
 declare module '../event' {
   export interface Events {
     /**
@@ -38,7 +21,7 @@ declare module '../event' {
         create_time: string
         chat_id: string
         chat_type: string
-        message_type: MessageType
+        message_type: keyof MessageContent
         content: string
         mentions: {
           key: string
diff --git a/adapters/lark/src/utils.ts b/adapters/lark/src/utils.ts
index b7f89e41..c22a6917 100644
--- a/adapters/lark/src/utils.ts
+++ b/adapters/lark/src/utils.ts
@@ -1,7 +1,7 @@
 import crypto from 'crypto'
 import { Context, h, Session, trimSlash, Universal } from '@satorijs/core'
 import { LarkBot } from './bot'
-import { EventPayload, Events, GetImChatResponse, Lark, MessageContentType, MessageType } from './types'
+import { EventPayload, Events, GetImChatResponse, Lark } from './types'
 
 export type Sender =
   | {
@@ -23,7 +23,7 @@ export function adaptSender(sender: Sender, session: Session): Session {
 }
 
 export async function adaptMessage(bot: LarkBot, data: Events['im.message.receive_v1'], session: Session, details = true): Promise<Session> {
-  const json = JSON.parse(data.message.content) as MessageContentType<MessageType>
+  const json = JSON.parse(data.message.content)
   const assetEndpoint = trimSlash(bot.config.selfUrl ?? bot.ctx.server.config.selfUrl) + bot.config.path + '/assets'
   const content: (string | h)[] = []
   switch (data.message.message_type) {
@@ -119,7 +119,7 @@ export async function adaptSession<C extends Context>(bot: LarkBot<C>, body: Eve
 
 // TODO: This function has many duplicated code with `adaptMessage`, should refactor them
 export async function decodeMessage(bot: LarkBot, body: Lark.Message, details = true): Promise<Universal.Message> {
-  const json = JSON.parse(body.body.content) as MessageContentType<MessageType>
+  const json = JSON.parse(body.body.content)
   const assetEndpoint = trimSlash(bot.config.selfUrl ?? bot.ctx.server.config.selfUrl) + bot.config.path + '/assets'
   const content: h[] = []
   switch (body.msg_type) {