During the Republic of China, Shanghai was prosperous on the surface, but in reality there was an undercurrent. Detective Lu Jingchen and his assistant Zhou Zimo accidentally uncovered the mysterious "Netherworld Plan" while investigating the mysterious disappearance of the Su family, which seemed to hide the power to control people's hearts. Under the heavy obstruction of the Youth Gang forces, they struggled to explore the truth on the dangerous Shanghai beach. Every step is full of unknowns and challenges. From the Su family manor to the streets, from underground passages to fierce gun battles, they move forward bravely in the darkness. This is just the beginning, more secrets need to be revealed urgently. Can they break through the difficulties and protect Shanghai? Let us walk into this ever-changing Shanghai together and explore the truth behind the shadows.