The Dongzhou City Bureau's Crime Division welcomes a seemingly weak and naive intern, Chi Xia, who is despised by the vicious captain Luo Xun. Little does anyone know that Chi Xia is a hidden crime-solving master who lurks in the bureau only to investigate the truth behind the mysterious death of his adoptive parents ten years ago. A series of murder cases occurred one after another. Chi Xia repeatedly solved strange cases with her amazing talent, which turned Luo Xun from doubt to trust. The two became partners in life and death, and gradually fell in love. When all the clues in the case pointed to the real culprit behind the code name "X", it was discovered that
