Teacher Lek (Arun Phawilai) is a Muay Thai coach who has been teaching a group of children to use Muay Thai for self-defense. They are Wuth (Nuttawuth Boonrapsap), Catt (Sanisa Chindamanee) and Pong (Paethaiy Wongkumlao). The three of them must take care of Wun (Darun Tantivichitvej), Wuth's younger brother, who has a heart disease. Because Wun suddenly suffered a heart attack and required emergency heart transfer surgery, they came to a hospital controlled by Peda (Johnny Ngian), the leader of an international terrorist organization. Inevitably, they must be involved in the severe test of this hospital, where fierce battles between heroic children and cruel terrorists take place...
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