"Undertide 1980" is set in Jiangzhou City in the early days of reform and opening up in 1980, and tells the story of the ups and downs of dock worker Gu Yunwei. While struggling to make a living at the docks of Jiangzhou City, he accidentally got involved in a gang dispute. On a rainy night, he rescued the second leader of the Qinglong Gang and stepped into the undercurrent of the rivers and lakes.
Caught between black and white, Gu Yunwei was dealing with smuggling gangs and corrupt officials while cooperating tacitly with Lin Xiaomei to pass intelligence to the police. With his extraordinary courage and wisdom, he resolved gang conflicts, managed a network of relationships, and gained a foothold in complex situations.
As the investigation deepens, the shady story of political and business collusion gradually emerges, and dangers follow. Gu Yunwei and Lin Xiaomei had a secret affection for each other in times of adversity and comforted each other. Faced with many difficulties, Gu Yunwei used a Browning pistol as a bargaining chip to reach an agreement with the police, and resolutely continued the in-depth investigation, just to fight for justice and the future of his family in the tide of the times. It shows the struggle, choice and perseverance of an ordinary person in a special era.