‘The Mystic Nine Tetralogy’ is a set of four side stories based in the same backdrop as The Mystic Nine. The stories are independent, but each focuses on one of the key characters in the original show (Huo San Niang, Chen Pi Ah Si, Lieutenant Zhang, and Er Yue Hong). They can be watched in no particular order and are often set as sequels to The Mystic Nine. They are certainly better understood if watched after the main series in order to be familiar with the characters and family history.

‘Four Belongs to Abelmoschus’ is the story of Chen Pi Ah Si.

The Butchering of Abelmoschus tells the origin story of young Chen Pi A Si, a pivotal figure in The Mystic Nine universe. Set during the chaotic Republican era in China, the film follows the teenage Chen Pi as he begins his life as a cold, calculated assassin, guided by a prophetic saying that seals his fate: “100 coins to kill a man.” His first commission comes from Chunsheng, a young fisherman whose entire family was slaughtered by the Huang Kui gang, leaving him with only 99 coins. Bound by his principle of never accepting less than the full price, Chen Pi refuses to act. But when Chunsheng sacrifices his life to complete the final coin, Chen Pi honors the payment and avenges the boy, setting off on a path of blood, vengeance, and unwavering resolve that will eventually lead him deep into the underworld.