Urban detective Chen Mo comes from a family that values boys over girls, and relies on his own efforts to escape from his original predicament. He has a calm personality and keen observation, but is often secretly discussed by his colleagues because of his family background. A late-night corpse dumping case broke the calm. The identity of the deceased became a mystery, and only a special button was left at the scene. As the investigation deepens, the case is secretly related to the disappearance of Chen Mo's sister many years ago. He not only has to withstand the pressure of solving the case, but also faces the obstruction and prejudice of his family. He also has to uncover the real murderer hidden in the shadows of the city among the intricate clues, and uncover the truth behind the two tragedies.
