One Piece: Seaside System - Chapter 11: Marine Based -

Five hundred years later, a superhuman talent cultivated by the state perished during a mission, and his soul transmigrated, taking possession of the body of a young master from a prominent family who suffered from an anxiety disorder. From that moment on, his extraordinary life began, spanning across various fields such as business and medicine. Wherever he set foot, others could only look up to him.

Ali Avery was a successful young man adored by everyone. But things were not as they were shown to the life. Shunned and betrayed by his peers... He was hiding among happy facades.

An upsurge of emotion, infinite fantasy, the wind waving Melaleuca, undefeated young blood! After the rebirth of Nie Yun lucky to have the ability to change the number of dantian law formula, others with a dantian practice, you use ten, one hundred!

- Description from Uukanshu

Xuan Yi was transported into the fictional world and became an elder of the Black Sword Sect! The moment he entered the world, he was at the Sea-Splitting Rank!