This Policeman Wants Me to Write a Novel?

When I woke up, I was involved in the death case of my little boy? I am a migrant worker myself, living a three-point and one-line life. Am I the biggest suspect? The only way to prove myself is for me to write the stories of these years? What's the point! After writing it, I was still designated as the final suspect, but I knew that there was another person involved in the matter. But "he" told me to shut up, how should I prove my innocence. Shen Yibai said that I should not fall into the trap of self-certification. "He" asked me to continue to prove myself. How on earth am I going to prove it...