Because Shen Yi has amnesia. After Shen Yi painted the mysterious woman, the woman said this before leaving: It will rain today, so be careful on your way home. You can see the danger signal from this sentence. Sure enough, Shen Yi was pushed into the sea while watching the sea.

Just because he was pushed into the sea, he drowned, which led to Shen Yi's amnesia. The key is to lose the memory of this mysterious woman, which is why Shen Yi can't draw.

This is also the most likely reasoning in the plot now. Shen Yi often goes to see a psychiatrist, hoping to find his lost memory through psychotherapy and successfully draw this mysterious woman.

Therefore, it is not difficult to see that the reason why Shen Yi can't draw the suspects who endanger the mining team is not because of shielding. The truth of the matter is that he has lost his memory, and he just erased the man's appearance from his mind because of drowning.

At the same time, according to this, it is not difficult to infer that we hope that Shen Yi will draw the man who killed the Thunder team. Either let Shen Yi drown again and deconstruct his memory, or help Shen Yi cure retrograde amnesia.