There is a turbulent underground undercurrent in Jiangcheng. Hongxing Society has been entrenched in smuggling, bail collection, and debt collection for many years. The iron rule of not touching drugs has become a tough nut for the police.
Lin Mo, a rookie police officer, carries the secret mission of the "Qianlong Project", transforms into a desperate low-level gangster, and sneaks into Hongxing Society alone. Starting out as a handyman in an auto repair shop, he endured humiliation, was cautious in his words and deeds, and relied on forbearance and resourcefulness to gain a foothold in the bloody storm.
The infighting within the gang is intensifying. The boss Zhao Shanhe is old and the second in command Vulture is ambitious to seize power. Lin Mo rose to prominence under Brother Hu. He repeatedly made contributions in bloody battles at the docks and turf battles, and gradually rose from a follower to the middle level.
He walks on the edge of life and death, pretending to be ruthless and dealing with all forces; while secretly collecting evidence and passing on intelligence. In the tug of loyalty and betrayal, conscience and survival, Lin Mo worked step by step, from the bottom of the ant to the peak of Hongxing Society's power, vowing to set off a huge wave to destroy the evil forces in the depths of the dark river.
