Chen Jie, the administrator of the Haicheng Municipal Library, is a gentle and harmless girl during the day, but at night she transforms into the second-in-command "designer" of the Qinglong Society, strategizing and controlling the gang situation. A sudden gang war posed an unprecedented challenge to her dual identity. At the same time, the mysterious capital boss Ji Xiaoting returns with the fire of revenge, vowing to destroy the Qinglong Society and the man behind it, Long Xiaotian. In this battle of wisdom, courage and revenge, Chen Jie and Ji Xiaoting accidentally discovered that they were long-lost brothers and sisters. Facing the family's blood feud and the undercurrent of the gang, how will the brother and sister join hands to write a shocking legend of revenge and redemption in the dark night of Haicheng?
