The hero of this film is a killer trained by Gui Foshan (Devil Sect) for many years. He is called "Jian" because he is good at flying swords to kill people. Later, he was betrayed and besieged by his partner, and his arm was cut off by his beloved. Jian, who was physically and mentally disabled, began to give up on himself until he was rescued by the heroine's family. Jian was gradually influenced and had a romantic name - Jian Twelve.