diff --git a/nonebot/adapters/dodo/event.py b/nonebot/adapters/dodo/event.py
index e055a6c..f3611e8 100644
--- a/nonebot/adapters/dodo/event.py
+++ b/nonebot/adapters/dodo/event.py
@@ -119,7 +119,7 @@ class MessageEvent(Event):
     message_type: MessageType = Field(alias="messageType")
     message_body: MessageBody = Field(alias="messageBody")
 
-    to_me: bool = Field(default=False, alias="toMe")
+    to_me: bool = False
 
     @property
     def message(self) -> Message:
@@ -127,9 +127,7 @@ def message(self) -> Message:
 
     @property
     def origin_message(self) -> Message:
-        if not hasattr(self, "_origin_message"):
-            return self.get_message()
-        return getattr(self, "_origin_message")
+        return getattr(self, "_origin_message", self.get_message())
 
     @property
     def reply(self) -> Optional[Reference]:
@@ -367,7 +365,7 @@ class PersonalMessageEvent(MessageEvent):
         default=EventType.PERSONAL_MESSAGE, alias="eventType"
     )
 
-    to_me: bool = Field(default=True, alias="toMe")
+    to_me: bool = True
 
 
 EventClass = Union[
diff --git a/nonebot/adapters/dodo/message.py b/nonebot/adapters/dodo/message.py
index f2c3edb..ccef716 100644
--- a/nonebot/adapters/dodo/message.py
+++ b/nonebot/adapters/dodo/message.py
@@ -9,6 +9,7 @@
     Tuple,
     Type,
     TypedDict,
+    Union,
 )
 from typing_extensions import Self, override
 
@@ -147,6 +148,22 @@ def card(
     #         },
     #     )
 
+    @override
+    def __add__(
+        self, other: Union[str, "MessageSegment", Iterable["MessageSegment"]]
+    ) -> "Message":
+        return Message(self) + (
+            MessageSegment.text(other) if isinstance(other, str) else other
+        )
+
+    @override
+    def __radd__(
+        self, other: Union[str, "MessageSegment", Iterable["MessageSegment"]]
+    ) -> "Message":
+        return (
+            MessageSegment.text(other) if isinstance(other, str) else Message(other)
+        ) + self
+
 
 class _TextData(TypedDict):
     text: str
@@ -352,6 +369,22 @@ class Message(BaseMessage[MessageSegment]):
     def get_segment_class(cls) -> Type[MessageSegment]:
         return MessageSegment
 
+    @override
+    def __add__(
+        self, other: Union[str, MessageSegment, Iterable[MessageSegment]]
+    ) -> "Message":
+        return super().__add__(
+            MessageSegment.text(other) if isinstance(other, str) else other
+        )
+
+    @override
+    def __radd__(
+        self, other: Union[str, MessageSegment, Iterable[MessageSegment]]
+    ) -> "Message":
+        return super().__radd__(
+            MessageSegment.text(other) if isinstance(other, str) else other
+        )
+
     @staticmethod
     @override
     def _construct(msg: str) -> Iterable[MessageSegment]: