Mun's family are masters in different styles of Taekwondo: Yoon in cooking style, Tae-yang in dancing style, Tae-mi in soccer style and youngest Typhoon can break anything with his steely forehead. Legendary Thai national treasure Kris of Kings is stolen by Korean businessman Suk-doo. Tae-yang rescues the Kris after giving chase to Suk-doo and his gang across Bangkok. Furious, Suk-doo has Typhoon kidnapped. To free their son, the family must steal the Kris of Kings back from Bangkok's National Museum... where they just happen to have been commissioned to perform a celebratory Taekwondo performance.