In fact, the identity of He Hong (M) has been clearly explained in the play, especially through her memories, we can find that she was one of the core figures in the case of human trafficking in beauty salons investigated by Lei Team in those years, and the mysterious woman who was looking for portraits in those years was her. After Zhen was abducted, M found out that Zhen was pregnant, so he made a deal with Zhen to take Oyasufu, and also had plastic surgery to look like Eric. After that, M lived the life of He Hong, which even Mu Wei, who married her, didn't know. In addition, the fake Eric played by M also successfully deceived Ann's biological father, Chu Tianqi, and let Chu Tianqi willingly take the fall for her.
However, although M is evil, she still has a little kindness in her heart, otherwise she would not pity Zhen Hehong for bringing down Oyasuf, nor would she always take care of Ann and bring her up. Even when she left Ann, she didn't want to hurt Ann, but waited until Ann fell asleep before leaving home. More importantly, M left a list for Du Cheng and Shen Yi, giving them a chance to rescue abducted women. Of course, some viewers may feel that if M really has good thoughts, he should turn himself in voluntarily. But you know, M is well aware of the energy behind the boss, and the evidence she has is not enough to bring down the other side. Therefore, on the premise that she wants to save herself, leaving a list for the police is the greatest help she can give Du Cheng and Shen Yi.
Generally speaking, M plays a key role in a picture book of hunting crimes. After all, she is not only a mysterious woman who was looking for Shen Yi's portrait in those days, but also one of the core figures of the criminal organization of human trafficking, and she is also a person who still has good thoughts despite all kinds of evils.