Twenty years ago, the vision of "Origin Tide" came, and a power called "Gang Yuan" appeared in the air. Warriors appear among human beings, and darkness under order and outside of rules also appears.
Lu Chen, a deliveryman, is a warrior in the Body Tempering Realm. In order to collect millions of "source needles" every month for his sister who suffers from "Gangmai withered", he plunged into the underground black boxing ring. The first game, the second game... With his positioning and terrain intuition developed by delivering food, he narrowly defeated powerful enemies time and time again. In a life-and-death duel, he was shocked to realize that under the scar on his left arm from the fire eighteen years ago, there was an alienated acupuncture point that could "swallow Gang Qi".
If you can swallow it, you will become stronger. But the Gang Qi swallowed is not pure, and if you eat too much, you will lose control.
On the day when he finally saved enough money for the needle, the arena was filled with blood all night, and the murder was framed on his head. The whole city is wanted, and the sister's illness, the fire that destroyed everything, the missing father, and the secret behind the "Original Tide" all point to the same answer -
He thought he was fighting for his sister. In fact, he has long been a pawn on the chessboard of this "origin tide".
