"Unbeatable" tells the story of former Hongkong champion Cheng Hui in the ring, not backward, debt laden down become middle-aged, rich two generations together, due to his father's business failed and nothing. Two scenery temporarily frustrated people, one in order to avoid debt, a to find father, met in Macao to become a boxing master. Hui in order to restore the dignity of life; Qi in order to encourage the missing father, don't give up, apprentice two people on the MMA platform, not afraid to challenge rivals.