In recent years, a paste called "Euphoria Cream" has been circulating in Anyun, a border town in Dazhen. In the backyard of a brothel, Song Yin discovers his comrade Meng Duo, who has been missing for a year, tortured by his drug addiction. The brothel owner kills Meng Duo. Song Yin swears to avenge his comrade. Unexpectedly he meets two other young people, they uncover the mastermind behind the scenes.