出身空手道世家的港日混血兒平川真理，因喪父、失戀而一蹶不振，在杜汶澤飾演的師傅地獄式訓練和激勵下越戰越強，最大敵人原來是自己。本身是空手道高手的杜汶澤當上導演不再搞笑，化身監製、導演、編劇、主演、武術指導，執意拍攝武術搏擊嚴肅題材，邀請自己師傅、空手道七段的倉田保昭和武術愛好者歐錦棠上場，拍出獨有韻味。執導筒猶如拾起空手道袍，純粹想挑戰自己。

Actor Chapman To may be best known for being a funnyman, but he’s also an avid student of karate with a black belt. After making two comedies behind the camera, To brings his passion for the sport to the big screen for this third directorial effort. In a radical departure from her usual romantic comedies, Stephy Tang stars as a young woman who tries to sell the karate dojo owned by her late father, only to find out that half of it belongs to one of his former pupils. Battered on all fronts in life, she is encouraged to regain her fighting spirit by stepping into the ring.