My Janitor Dad is the Supreme?

My Janitor Dad is the Supreme?

20 years ago, martial artist Chris's victory caused opponent Charles's death, leading to a massacre by disciple Lucas. Realizing true martial virtue, Chris hid with his son Henry in a dojo. Now grown, Henry seeks revenge in a tournament held by impostor Zack. When Henry is endangered, Chris reveals his skill to save him, uncovering others' plot.