It starts with a murder case, and the murderer Di Cinglin is a Marquis. Because his girl friend knew of this thing, he also killed his girl friend. But when Ruyu, a good female companion of his girl friend, found the girl's body, she thought Di Cinglin was responsible for this, then she passed this information to Yang Jheng.

      Yang was very busy. He had just stopped a wugong contest between two top martial arts masters Ying Wuwu and Lan Yichen, Ying is Di Cinglin's teacher and Lan is Yang Jheng's father's best friend. Then he led his fellow constables to arrest the infamous robber Ni Ba and brought back a huge amount of stolen money. However the money lost again and two of his subordinates in charge of carrying the money also disappeared. Although Yang was suspected of stealing the money, his head office backed him up.

      Then Yang turned to Ruyu. He thought Ruyu's life was in danger so he took Ruyu to his father's old place. His father died and left him the strange weapon Libie Gou. He uses this weapon to punish evil.

      The Marquis Di Cinglin committed another unforgivable murder; he killed his teacher Ying Wuwu because he thought that he had learned everything from his teacher already. At the same time Yang got the information that the stolen money was in Di's storage room. So he called on Di's huge manor. Di admitted the crimes, but he refused to surrender. He was very contemptuous of Yang's wugong and Yang's background; Yang's father was an ill-famed thief. So he thought that he could easily smash Yang. When his sword pinned down one of Yang's arms, he believed that Yang was under his control. However Yang used the Libie Gou to cut free his pinned down arm, and, before Di could recover from what happened in front of his eyes, Yang's Libie Guo sliced Di's throat.

      Libei Guo is one of the author Gu Long's seven book series. Each of these seven books uses the name of a special weapon to be its title, and its protagonist is the outstanding hero who employs the special weapon. Each of them has a different moral, and jiaojhe bibai, the arrogant one suffers, is the moral of this story.