Mo Yang, who has a low self-esteem and is taciturn, has followed his grandfather in the countryside to learn the lost martial arts "Gu Zhuang Quan" since he was a child. The gears of fate have inadvertently pushed this young man to the edge of darkness, from a "good boy" to a killer who is feared by everyone in the underworld. What kind of setbacks has he experienced? A wonderful story is about to be staged...