Watch Kill-Fist (2019) Official Trailer

Zhang, a middle aged man struggling with a dead end job as an insurance sales person, on the verge of divorce with his wife, losing custody of her daughter, and on top of all this he has to take care of his father who is suffering from Alzheimer's. Unknowingly Zhang is invited to join an underground fighting game for financial purposes, but eventually Zhang becomes hooked on the fights and turns professional.