After a large-scale police crackdown, narcotics officer Yang Yi Peng seizes a critical lead with captured but defiant ringleader Mou Hai Dong. Alongside rookie officer Zhi An and informant Duo Zai, Yang follows a trail back to Mou Sen’s new synthetic drug operation, uncovering a complex web of drug networks. But as they delve deeper, the true mastermind remains elusive, hidden behind layers of secrecy.