diff --git a/matrix_appservice_kakaotalk/db/message.py b/matrix_appservice_kakaotalk/db/message.py
index ace4ed1..1010565 100644
--- a/matrix_appservice_kakaotalk/db/message.py
+++ b/matrix_appservice_kakaotalk/db/message.py
@@ -84,15 +84,15 @@ class Message:
 
     @classmethod
     async def get_closest_before(
-        cls, kt_chat: int, kt_receiver: int, timestamp: int
+        cls, kt_chat: int, kt_receiver: int, ktid: Long
     ) -> Message | None:
         q = (
             f"SELECT {cls.columns} "
-            "FROM message WHERE kt_chat=$1 AND kt_receiver=$2 AND timestamp<=$3 AND "
+            "FROM message WHERE kt_chat=$1 AND kt_receiver=$2 AND ktid<=$3 AND "
             "                   ktid IS NOT NULL "
-            "ORDER BY timestamp DESC LIMIT 1"
+            "ORDER BY ktid DESC LIMIT 1"
         )
-        row = await cls.db.fetchrow(q, kt_chat, kt_receiver, timestamp)
+        row = await cls.db.fetchrow(q, kt_chat, kt_receiver, ktid)
         return cls._from_optional_row(row)
 
     _insert_query = (
diff --git a/matrix_appservice_kakaotalk/portal.py b/matrix_appservice_kakaotalk/portal.py
index b68744d..ee2cb0a 100644
--- a/matrix_appservice_kakaotalk/portal.py
+++ b/matrix_appservice_kakaotalk/portal.py
@@ -1277,6 +1277,20 @@ class Portal(DBPortal, BasePortal):
                 await self.main_intent.redact(message.mx_room, message.mxid, timestamp=timestamp)
             await message.delete()
 
+    async def handle_kakaotalk_chat_read(self, source: u.User, sender: p.Puppet, chat_id: Long) -> None:
+        if not self.mxid:
+            return
+        msg = await DBMessage.get_closest_before(self.ktid, self.kt_receiver, chat_id)
+        if not msg:
+            return
+        if not await self._bridge_own_message_pm(source, sender, "read receipt", invite=False):
+            return
+        # NOTE No need for timestamp when the read receipt happened, since this is only for live ones
+        await sender.intent_for(self).mark_read(msg.mx_room, msg.mxid)
+        self.log.debug(
+            f"Handled KakaoTalk read receipt from {sender.ktid} up to {chat_id}/{msg.mxid}"
+        )
+
     async def handle_kakaotalk_user_join(
         self, source: u.User, user: p.Puppet
     ) -> None:
diff --git a/matrix_appservice_kakaotalk/user.py b/matrix_appservice_kakaotalk/user.py
index 2dfb4dc..cf53342 100644
--- a/matrix_appservice_kakaotalk/user.py
+++ b/matrix_appservice_kakaotalk/user.py
@@ -736,7 +736,7 @@ class User(DBUser, BaseUser):
         )
         if portal and portal.mxid:
             await portal.backfill_lock.wait(f"read receipt from {sender_id}")
-            await portal.handle_kakaotalk_read(self, puppet, chat_id)
+            await portal.handle_kakaotalk_chat_read(self, puppet, chat_id)
 
     @async_time(METRIC_PROFILE_CHANGE)
     async def on_profile_changed(self, info: OpenLinkChannelUserInfo) -> None: