diff --git a/matrix_appservice_kakaotalk/kt/client/client.py b/matrix_appservice_kakaotalk/kt/client/client.py
index c404bce..17b7e2b 100644
--- a/matrix_appservice_kakaotalk/kt/client/client.py
+++ b/matrix_appservice_kakaotalk/kt/client/client.py
@@ -49,7 +49,7 @@ from ..types.request import (
     CommandResultDoneValue
 )
 
-from .types import PortalChannelInfo, UserInfoUnion
+from .types import PortalChannelInfo, UserInfoUnion, ChannelProps
 
 from .errors import InvalidAccessToken
 from .error_helper import raise_unsuccessful_response
@@ -207,34 +207,34 @@ class Client:
         )
         return profile_req_struct.profile
 
-    async def get_portal_channel_info(self, channel_id: Long) -> PortalChannelInfo:
+    async def get_portal_channel_info(self, channel_props: ChannelProps) -> PortalChannelInfo:
         return await self._api_user_request_result(
             PortalChannelInfo,
             "get_portal_channel_info",
-            channel_id=channel_id.serialize()
+            channel_props=channel_props.serialize(),
         )
 
-    async def get_participants(self, channel_id: Long) -> list[UserInfoUnion]:
+    async def get_participants(self, channel_props: ChannelProps) -> list[UserInfoUnion]:
         return await self._api_user_request_result(
             ResultListType(UserInfoUnion),
             "get_participants",
-            channel_id=channel_id.serialize()
+            channel_props=channel_props.serialize()
         )
 
-    async def get_chats(self, channel_id: Long, sync_from: Long | None, limit: int | None) -> list[Chatlog]:
+    async def get_chats(self, channel_props: ChannelProps, sync_from: Long | None, limit: int | None) -> list[Chatlog]:
         return await self._api_user_request_result(
             ResultListType(Chatlog),
             "get_chats",
-            channel_id=channel_id.serialize(),
+            channel_props=channel_props.serialize(),
             sync_from=sync_from.serialize() if sync_from else None,
             limit=limit
         )
 
-    async def send_message(self, channel_id: Long, text: str) -> Chatlog:
+    async def send_message(self, channel_props: ChannelProps, text: str) -> Chatlog:
         return await self._api_user_request_result(
             Chatlog,
             "send_message",
-            channel_id=channel_id.serialize(),
+            channel_props=channel_props.serialize(),
             text=text
         )
 
diff --git a/matrix_appservice_kakaotalk/kt/client/types.py b/matrix_appservice_kakaotalk/kt/client/types.py
index f44b9e8..aa8d0b1 100644
--- a/matrix_appservice_kakaotalk/kt/client/types.py
+++ b/matrix_appservice_kakaotalk/kt/client/types.py
@@ -21,7 +21,9 @@ from attr import dataclass
 
 from mautrix.types import SerializableAttrs, JSON, deserializer
 
+from ..types.bson import Long
 from ..types.channel.channel_info import NormalChannelInfo
+from ..types.channel.channel_type import ChannelType
 from ..types.openlink.open_channel_info import OpenChannelInfo
 from ..types.user.channel_user_info import NormalChannelUserInfo, OpenChannelUserInfo
 
@@ -56,3 +58,9 @@ class PortalChannelInfo(SerializableAttrs):
     participants: list[UserInfoUnion]
     # TODO Image
     channel_info: Optional[ChannelInfoUnion] = None # Should be set manually by caller
+
+
+@dataclass
+class ChannelProps(SerializableAttrs):
+    id: Long
+    type: ChannelType
diff --git a/matrix_appservice_kakaotalk/portal.py b/matrix_appservice_kakaotalk/portal.py
index bbb928a..2b4bb94 100644
--- a/matrix_appservice_kakaotalk/portal.py
+++ b/matrix_appservice_kakaotalk/portal.py
@@ -52,7 +52,7 @@ from .kt.types.channel.channel_info import ChannelInfo
 from .kt.types.channel.channel_type import KnownChannelType, ChannelType
 from .kt.types.chat.chat import Chatlog
 
-from .kt.client.types import UserInfoUnion, PortalChannelInfo
+from .kt.client.types import UserInfoUnion, PortalChannelInfo, ChannelProps
 from .kt.client.errors import CommandException
 
 if TYPE_CHECKING:
@@ -194,6 +194,13 @@ class Portal(DBPortal, BasePortal):
                 raise ValueError(f"Non-direct chat portal should have no sender, but has sender {self._kt_sender}")
         return self._kt_sender
 
+    @property
+    def channel_props(self) -> ChannelProps:
+        return ChannelProps(
+            id=self.ktid,
+            type=self.kt_type
+        )
+
     @property
     def main_intent(self) -> IntentAPI:
         if not self._main_intent:
@@ -245,7 +252,7 @@ class Portal(DBPortal, BasePortal):
     ) -> PortalChannelInfo:
         if not info:
             self.log.debug("Called update_info with no info, fetching channel info...")
-            info = await source.client.get_portal_channel_info(self.ktid)
+            info = await source.client.get_portal_channel_info(self.channel_props)
         changed = False
         if not self.is_direct:
             changed = any(
@@ -400,7 +407,7 @@ class Portal(DBPortal, BasePortal):
     async def _update_participants(self, source: u.User, participants: list[UserInfoUnion] | None = None) -> bool:
         if participants is None:
             self.log.debug("Called _update_participants with no participants, fetching them now...")
-            participants = await source.client.get_participants(self.ktid)
+            participants = await source.client.get_participants(self.channel_props)
         changed = False
         if not self._main_intent:
             assert self.is_direct, "_main_intent for non-direct chat portal should have been set already"
@@ -736,7 +743,7 @@ class Portal(DBPortal, BasePortal):
         converted = await matrix_to_kakaotalk(message, self.mxid, self.log)
         try:
             chatlog = await sender.client.send_message(
-                self.ktid,
+                self.channel_props,
                 text=converted.text,
                 # TODO
                 #mentions=converted.mentions,
@@ -959,7 +966,7 @@ class Portal(DBPortal, BasePortal):
         self.log.debug(f"Backfilling history through {source.mxid}")
         self.log.debug(f"Fetching {f'up to {limit}' if limit else 'all'} messages through {source.ktid}")
         messages = await source.client.get_chats(
-            channel_info.channelId,
+            self.channel_props,
             after_log_id,
             limit
         )
@@ -989,7 +996,6 @@ class Portal(DBPortal, BasePortal):
             # TODO Save kt_sender in DB instead? Depends on if DM channels are shared...
             user = await u.User.get_by_ktid(self.kt_receiver)
             assert user, f"Found no user for this portal's receiver of {self.kt_receiver}"
-            # TODO Should this backfill? Useful for forgotten channels
             await self._update_participants(user)
         else:
             self.log.debug("Not setting _main_intent of new direct chat until after checking participant list")
diff --git a/matrix_appservice_kakaotalk/user.py b/matrix_appservice_kakaotalk/user.py
index d184211..feca078 100644
--- a/matrix_appservice_kakaotalk/user.py
+++ b/matrix_appservice_kakaotalk/user.py
@@ -499,7 +499,7 @@ class User(DBUser, BaseUser):
             kt_receiver=self.ktid,
             kt_type=channel_info.type
         )
-        portal_info = await self.client.get_portal_channel_info(channel_info.channelId)
+        portal_info = await self.client.get_portal_channel_info(portal.channel_props)
         portal_info.channel_info = channel_info
         if not portal.mxid:
             await portal.create_matrix_room(self, portal_info)
diff --git a/node/src/client.js b/node/src/client.js
index efaa17a..ff300ea 100644
--- a/node/src/client.js
+++ b/node/src/client.js
@@ -24,6 +24,8 @@ import {
 	util,
 } from "node-kakao"
 /** @typedef {import("node-kakao").OAuthCredential} OAuthCredential */
+/** @typedef {import("node-kakao/dist/talk").TalkChannelList} TalkChannelList */
+/** @typedef {import("node-kakao").ChannelType} ChannelType */
 
 import chat from "node-kakao/chat"
 const { KnownChatType } = chat
@@ -68,6 +70,30 @@ class UserClient {
 		return userClient
 	}
 
+	/**
+	 * @param {Object} channel_props
+	 * @param {Long} channel_props.id
+	 * @param {ChannelType} channel_props.type
+	 */
+	async getChannel(channel_props) {
+		let channel = this.#talkClient.channelList.get(channel_props.id)
+		if (channel) {
+			return channel
+		} else {
+			const channelList = getChannelListForType(
+				this.#talkClient.channelList,
+				channel_props.type
+			)
+			const res = await channelList.addChannel({
+				channelId: channel_props.id,
+			})
+			if (!res.success) {
+				throw new Error(`Unable to add ${channel_props.type} channel ${channel_props.id}`)
+			}
+			return res.result
+		}
+	}
+
 	close() {
 		this.#talkClient.close()
 	}
@@ -337,11 +363,11 @@ export default class PeerClient {
 	/**
 	 * @param {Object} req
 	 * @param {string} req.mxid
-	 * @param {Long} req.channel_id
+	 * @param {Object} req.channel_props
 	 */
 	getPortalChannelInfo = async (req) => {
 		const userClient = this.#getUser(req.mxid)
-		const talkChannel = userClient.talkClient.channelList.get(req.channel_id)
+		const talkChannel = await userClient.getChannel(req.channel_props)
 
 		const res = await talkChannel.updateAll()
 		if (!res.success) return res
@@ -356,24 +382,24 @@ export default class PeerClient {
 	/**
 	 * @param {Object} req
 	 * @param {string} req.mxid
-	 * @param {Long} req.channel_id
+	 * @param {Object} req.channel_props
 	 */
 	getParticipants = async (req) => {
 		const userClient = this.#getUser(req.mxid)
-		const talkChannel = userClient.getChannel(req.channel_id)
+		const talkChannel = await userClient.getChannel(req.channel_props)
 		return await talkChannel.getAllLatestUserInfo()
 	}
 
 	/**
 	 * @param {Object} req
 	 * @param {string} req.mxid
-	 * @param {Long} req.channel_id
+	 * @param {Object} req.channel_props
 	 * @param {Long?} req.sync_from
 	 * @param {Number?} req.limit
 	 */
 	getChats = async (req) => {
 		const userClient = this.#getUser(req.mxid)
-		const talkChannel = userClient.talkClient.channelList.get(req.channel_id)
+		const talkChannel = await userClient.getChannel(req.channel_props)
 
 		const res = await talkChannel.getChatListFrom(req.sync_from)
 		if (res.success && 0 < req.limit && req.limit < res.result.length) {
@@ -385,12 +411,12 @@ export default class PeerClient {
 	/**
 	 * @param {Object} req
 	 * @param {string} req.mxid
-	 * @param {Long} req.channel_id
+	 * @param {Object} req.channel_props
 	 * @param {string} req.text
 	 */
 	sendMessage = async (req) => {
 		const userClient = this.#getUser(req.mxid)
-		const talkChannel = userClient.talkClient.channelList.get(req.channel_id)
+		const talkChannel = await userClient.getChannel(req.channel_props)
 
 		return await talkChannel.sendChat({
 			type: KnownChatType.TEXT,
@@ -517,3 +543,18 @@ export default class PeerClient {
 		return value
 	}
 }
+
+
+/**
+ * @param {TalkChannelList} channelList
+ * @param {ChannelType} channelType
+ */
+function getChannelListForType(channelList, channelType) {
+	switch (channelType) {
+	case "OM":
+	case "OD":
+		return channelList.open
+	default:
+		return channelList.normal
+	}
+}