In Shanghai during the Republic of China, the waves in Huangpu were in a hurry.
Li Huaian, a dock coolie, struggled to survive in the cracks between gangs, police stations, and Japanese puppets. A crisis and an unexpected rescue caused the ants at the bottom to be involved in the torrent of the times. He established himself with loyalty and turned over with wisdom. From a downtrodden coolie, he stepped into the core of the gang and the frontline of the espionage war. Under the guidance of the underground party Su Qingyan, he finally chose the justice of his family and country in the dark and troubled times and embarked on the road of revolution. Ten miles away from home, there are all kinds of ups and downs, and the undercurrent of Huangpu describes the character of the little people in troubled times.