The story follows anti-narcotics officer Yang Yipeng, who, after a major police crackdown, seizes the arrest of drug lord Mou Haidong—still resisting even in custody—as a breakthrough point. With the support of rookie officer An and the assistance of informant Duo Zai, Yang traces leads from Mou Sen to the source of a new synthetic drug. Their investigation uncovers sprawling trafficking networks stretching across Hong Kong, southern Hunan, and the Yunnan–Sichuan border region. Yet, the true mastermind behind it all remains hidden in the shadows…