Psychological Chaser, the Intern of the Cold-Blooded Captain

This is my first time trying to write about the subject of criminal investigation. The logic may not be clear, so I don't want to proceed with caution! ! ! On the first day of the internship, he discovered that he was being followed, and discovered that the unsolved case ten years ago might be related to his parents. The cold and tough city criminal investigation captain who always had a bad face was telling the truth. The mantra changed from "Intern, go aside." To "Su Nianqing, stand behind me."