In the Shanghai River in 1935, the French Concession was surrounded by fog, and there was an undercurrent of smoke and dust.
Young police officer Qin Zhengchuan stepped into the anti-drug dark web with a lonely heart. A copper whistle engraved with half of his name was his only connection with the newly promoted police officer Jiang Nian'an. One person is guarding the bottom line of order in the French Concession, and the other is hiding in the dark to collect evidence of drug lords' crimes. The sound of the copper whistle has become a life-and-death response on the edge of danger.
The old grudges of their parents are always there, and the traps of drug dealers are closing in step by step. They track down each other in the fog and protect each other in the hail of bullets. When the whistle cuts through the long night, it is the determination to break the situation side by side; in the embers after the smoke is burned out, there is the unspoken concern.
But the snare of fate has never relaxed. When the truth emerges, the confrontation of attitudes and the coercion of fate will eventually push the two to the cliff of choice. There is no end to the sound of the copper whistle, and the road ahead for drug control has never been smooth. Some people fell on the dock as dawn approached, and some continued to blow the unfinished whistle.
Purpose: Focusing on the anti-drug battlefield in the Sino-French Concession in the turbulent years of the Republic of China, through the two male protagonists' choices to fight drug lords and dark forces with their faith in justice and flesh and blood, it eulogizes the courage of the little people in the turbulent era to stick to the bottom line, and interprets the spiritual core of "Although the anti-drug road is difficult, the fire of justice will never be extinguished."