Barnett Grant, a delivery driver, buys a "fake" martial arts manual from an old beggar, only to awaken real, terrifying power. After accidentally injuring Chloe Reynolds, he marries into her family, a fallen martial clan under siege. When he casually masters the long-lost Chaos Tai Chi Art, everyone mistakes him for a hidden grandmaster. One fight after another, Barnett crushes elite rivals, revives the Reynolds family, and begins to realize he may be a once-in-a-century martial arts genius.