Bond (Vanness Wu) is a high-school student whose real passion is Muay Thai kickboxing, which he practices at a club headed by Lau (Gordon Liu). His ambition is to enter the prestigious Star Runner competition, and he devotes himself to that goal at the expense of his school work. Having to take Summer classes, he meets the young Korean teacher Mei Chiu (Kim Hyun-Joo), and soon enough they’re in love. But as his focus moves from training for the competition to romancing Mei Chiu, someone else is chosen by Lau to represent the club in the competition, and Bond is expelled for having resisted this decision. But not all is lost as Bill (Max Mok), a washed-out former martial arts champion, takes him under his wing and teaches him to incorporate elements from other martial arts into his muay Thai. Together they form a team and enter the Star Runner competition, with an eye on challenging Tank (Andy On), the reigning champion.

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