What does the end of hunting crime mean?

The ending of the film and television drama shows that Du Cheng and Shen Yi successfully arrested Chen Zhou, exposed a series of crimes and avenged the Thunder.

This is a good ending, justice has been done and criminals have been punished. However, the ending also left a lot of foreshadowing, indicating that there may be a second season. At the end of the plot, a man in black broke into Shen Yi's home, looked through Shen Yi's photo album, and finally cut Shen Yi's self-portrait with a knife to reveal the black and white background.

This move is very strange, which makes people have more questions about Shen Yi's identity and the story behind it. Below the colored eyes are black and white eyes, staring at the front fiercely, which seems to imply that there are still many secrets of Shen Yi's identity that have not been revealed.