Ling Chenxiao originally thought that she could work with him as a policeman to eliminate violence and bring peace to the people. Although it was dangerous, she didn't care with him by her side. Jiang Yi, who originally thought he would always be in competition with the police, is a master of both black and white. Although he has supreme power, he is lonely. When the weakness of human nature pushed her to the forefront, and she was forced to rely on the power of sex as a resistance to fate, her belief in good and evil was shaken for the first time, and she gradually sank. When he accidentally rescued her who was an enemy, he experienced for the first time the beauty of traveling between the black and white worlds and giving her everything, and gradually fell in love with her. Black and white are originally water and fire, but human nature merges them and turns them into bright colors.