After the leader of the underworld Hongxing Society, Dinosaur, was killed by Yaoyang of the East Star Society, the leader Jiang Tianyang (Man Ziliang) decided to choose one from Shan Ji (Chen Xiaochun) and Shengfan to fill the vacancy. Haonan (Ekin Cheng), the leader of Causeway Bay, knew the pressure of the position and urged Shan Ji to give up fighting for power, but the persuasion was ineffective. In order to suppress Shan Ji, Shengfan colluded with Yaoyang to set up a trick, causing Shan Ji's friend Da Tianer to die. On the other hand, Yanyan (Li Jiaxin), a middle school teacher in Tuen Mun District, has always been disgusted with the underworld, but after meeting Haonan, her previous impression of the underworld has changed. In a short period of time, she has developed admiration for Haonan and the two have a one-night stand. However, because they live in two completely different worlds, and Haonan has never been able to forget his ex-girlfriend (Gigi Lai), their relationship is destined to end in vain.