Professional freestyle fighter Holden Han unexpectedly loses his daughter, resulting in his wife leaving him and his expulsion from the association, leading him into a life of despair. The appearance of his landlady Natalia Chen and her daughter Mia becomes a new hope in his life. However, Mia is targeted and kidnapped by the criminal gang leader Grant Qin due to her rare blood type. Holden picks up his fists again and engages in a desperate battle against the criminal forces. With the help of ordinary people from the margins of society, he ultimately defeats the villains!