City Under Siege

Sunny, a young and inexperienced circus performer, hopes to follow in his father's footsteps as a skilled knife thrower. Despite his ambitions, he faces bullying from his fellow performers, who assign him the role of a clown. While touring in Malaysia with Cheung and the rest of the troupe, they come across a hidden cave that was used by the Japanese army during World War II. Inside the cave, instead of discovering treasure, the group is exposed to an unknown chemical substance that transforms them into superhuman mutants, including Sunny.