My Janitor Dad is the Supreme?

Twenty years ago Xiao Shi won the title of Supreme, and his opponent Zhao Chuan died from the bout. Zhao Chuan's disciple Chen He answered that by killing Xiao Shi's entire family. Only his small son Xiao Hui came through it. Xiao Shi decided that the highest use of martial arts is stopping a fight rather than winning one, buried his name, and took a job sweeping floors at the Youlong martial arts hall so he could raise the boy inside its walls. Twenty years on, Xiao Hui is the senior student there. He thinks his father is a coward who cleans up after fighters, and he has spent his life planning to find the Supreme, learn from him, and settle the debt. Zhao Zhenghe, who is passing himself off as the Supreme, announces a tournament that every entrant must sign a life and death waiver to join. Xiao Hui enters over his father's objection. When a match puts him in real danger, Xiao Shi steps out and fights, and his son finally sees what the janitor can do. Xiao Hui demands the truth and gets nothing, because his father has already worked out that someone arranged all of it.