Cheng is a young Chinese mainlander who moves in with his expatriate cousins to work at an ice factory in Thailand. He does this with a family promise never to get involved in any fights. However, when members of his family begin disappearing after meeting the management of the factory, the resulting mystery and pressures force him to break that vow and take on the villainy of the Big Boss.

Chen Chen returns to his former school in Shanghai when he learns that his beloved instructor has been murdered. While investigating the man's death, Chen discovers that a rival Japanese school is operating a drug smuggling ring. To avenge his master’s death, Chen takes on both Chinese and Japanese assassins… and even a towering Russian.