The Janitor's Mighty Fist

The Luminary Society has been running the martial arts tournament for its own ends. It gave away a competitor's place to a rival school, using the name of a fighter who was not there to object, and its leader has been taking fighters and experimenting on them with technology. The name it used belongs to Chu Tian, once the Martial Lord, who vanished at the unmasking ceremony. His mother died and her last wish was that he give up martial arts for three years, so he spent them as a cleaner, staying near his sister without telling her who he was. The three years are ending as the tournament begins. His sister is losing her match and he helps her from the crowd, which gets him laughed at. When his school is threatened he breaks the seal on his power in front of everyone. Then he learns what happened to his place in the competition, so he enters the qualifiers to find out who arranged it, and works toward the Society's leader.