Zuo Hang

Deputy captain of the anti-narcotics brigade Tang Lang and the female special police captainYue Xiaofeng are two public security police who are working together on the front line of life and death.

Anti-drug officer Zhang Zhuoying and her unconventional partner Wang Xingjian team up to investigate a deadly new drug, C2. As their pursuit uncovers links to a decades-old case, they join forces with past and present officers to take down a dangerous drug ring and uncover hidden truths.

During the Japanese occupation of Harbin, a covert resistance group disguised as a harmonica society uses music to transmit intelligence and fight back against enemy forces, enduring betrayal and sacrifices.