One year after drug lord Mao Zi murders anti-narcotics officer Xiao Yu, his partner Lao Xiang feigns madness to hide her identity while living with Ying Shu, Mao Zi’s associate, waiting for a chance at revenge. When police learn that Mao Zi will use taxi driver Liu Ji to transport drugs, they intercept him and recruit him as an informant. Reluctantly, Liu Ji agrees to help the police, leading him and Lao Xiang to cross paths by the salt lake as they embark on a dangerous journey together.