Gym coach Su Xiao seems ordinary, but in fact she is the descendant of "Xingyiquan" - she hides her identity as an ancient martial artist by teaching fitness. Once when a gangster harassed a student, Su Xiao took action to subdue him and was invited by the Martial Arts Bureau to compete. In the "Urban Martial Arts Tournament", she used Xingyiquan to defeat the "Taekwondo Black Belt" and "Muay Thai Boxing King", and finally won the championship. She also exposed the "doping" shady story in the event.
