When Captain Lei was killed, it had a lot to do with the mysterious woman, and it also had an indirect relationship with the famous talented painter in Jiangbei. The mysterious woman got a picture of a child and asked Song Yi to draw a picture of a 35-year-old man. Unexpectedly, after painting, she recognized that it was Captain Lei, who was killed. After being killed, Captain Lei was pushed into the river and lost his memory, so he couldn't draw a portrait of the mysterious woman.
At that time, Captain Lei had an important clue to a human trafficking organization, in which M, the core member, was found by the black hand behind the scenes and dissolved the organization, while M defected and took away important documents. After that, M changed his face and became He Hong.
In the jewel robbery, and Du Cheng tracked down Eric, but the criminal police found that they caught up with him but were killed, just like the way Captain Lei died seven years ago. Yi Song forced himself to recall the past and finally remembered that the mysterious woman was M.
Although Yi Song remembered that the mysterious woman was M and M was He Hong, M fell from a tall building before meeting Du Cheng at the appointed place, and Du Cheng was framed. It was Zhou Jun who really killed Captain Lei, and so was M's death. He was the one who commanded behind the scenes. Finally, Zhou Jun died.