Legend has it that there are many underworld forces hidden in Muyun City, among which the Liang family and the Liu family, who are mainly engaged in business, and the underworld force "Sanqi Dao" are the most famous. Meng Sanxi, a martial arts master who once roamed the world and had a chivalrous heart, has been investigating the case of his friend who was killed in Muyun City. Meng Sanxi and Liang Nianyu met when they were young. Liang Nianyu was upright and optimistic. The two of them walked together in the underworld because of their similar interests, exterminating evil and helping the weak, and doing chivalrous things. Unexpectedly, when they were tracking down clues related to the underworld force "Sanqi Dao" in Tinghu, Liang Nianyu unfortunately fell into a trap that had been set for him and died...