I'm in One Piece, and I'm Luffy's childhood friend.

[One Piece] [Following the Ship]
The power of two Tremor-Tremor Fruits appeared during the Marineford War!
Could the emergence of two world-destroying forces change the outcome of the Marineford War?
And it all started when our protagonist, Bai Yun, traveled through time and met Luffy as a child.
.......
As the saying goes, when you're down on your luck, even drinking cold water can cause you to choke.
Bai Yun made a casual remark, and then suddenly died and was transported to the world of One Piece.
Yes, there is a system.
What do you mean by coming out to make a sarcastic remark, then handing over a fruit and running away???