Xiao Zhan, a security guard in the community, was once the "undefeated legend" in the underground boxing ring. He retired after accidentally injuring his opponent. When his girlfriend was bullied by a rich second generation, Xiao Zhan returned to the world and participated in the "Urban Martial Arts Competition". He defeated the "Muay Thai King" and "Taekwondo Black Belt" along the way, and met his old enemy in the final - the son of the opponent he accidentally injured. In the end, Xiao Zhan used the martial arts spirit of "conquering people with virtue" to resolve the grudges and become an urban martial arts saint.
