I'm in One Piece: I Might Actually Be Invincible!

He accidentally transmigrates to the world of One Piece, only to become Ace's uncle.

After living under a hidden identity for more than twenty years, he discovers that he can't cultivate.

Then, just as the System awakens, he becomes invincible without even realizing it.

He keeps fighting pirates and the Marines, always taking the role of the challenger!

Kaido: "This kid can take even more punishment than I can!"

Garp: "For the first time, I've met a fist harder than mine!"

Mihawk: "He's the world's greatest swordsman!"

Only when Ron sees the Marine Admiral lying before him does he suddenly realize just how strong he is!

This novel and its characters are entirely fictional. Any resemblance to real people or events is purely coincidental. Do not imitate.