In Hong Kong in the late 1950s and early 1960s, police and bandits colluded and there was a foul atmosphere. Among them, the Kowloon Walled City is a place where dragons and snakes occupy it, making people feel scared. The idle young people, Ah Hao (Liu Qingyun) and Ah Le (Wu Zhenyu), accidentally mingle here. They are infected by the chaotic atmosphere here and are happy and do not miss the place. They collaborated to gamble on horses to defraud money, which was chased by the Zhuang family. Fortunately, Fei Bao, the eldest brother of the city village, stepped in to save their lives, and the fate of the two changed since then. Ah Hao joins Fei Bao's door, and later falls in love with Fei Bao's sister-in-law, Dandan Ying (Peng Ling)...