Unbeatable (2013) on Netflix

Plot summary

Ching Fai was a boxing champion before financial trouble and Triad involvement sent him to prison; he now drives a taxi. When loan sharks torch the taxi and demand the money he owes, he leaves for Macau, where an old friend offers him work in a gym. He rents a room from Peidan, a young girl caring for a mother with psychological problems. At the gym, Lin Si Qi asks to learn mixed martial arts for the Golden Rumble, a tournament with a millions-dollar prize; his father, a businessman, lost a fortune in a failed deal and has become a depressed drunkard. Fai agrees to train him, and sets a strict regimen months ahead of the event. Fai also grows close to Peidan and her mother.