Yu, whose parents were shot due to a forensic misjudgment, became an orphan. The government compensated Lin Yu with a sum of money and sent him to Baiyun Orphanage. There, he met a man named Fu Ran, and the two of them played very well. Later, Fu Ran was adopted, but he didn't expect that his adoptive parents would buy him into a killer organization. In order to survive, he could only obey the orders of the organization. At this time, Lin Yu also grew up, passed the police academy, and became a forensic doctor. Fu Ran received an order from the organization: get close to your childhood sweetheart, use him to destabilize society, and I will let you go. Fu Ran slowly got closer to Lin Yu. He had never had any feelings for Lin Yu, he was just acting on occasion. After going through the police academy murder case, the building murder case and the bar murder case, he successfully got close to Lin Yu, without what he expected. Lin Yu had actually discovered his identity a long time ago, but he didn't reveal it because he wanted to use him for revenge. No one doubted Fu Ran at first, but he gradually developed feelings for Lin Yu. And they planted the sunflowers they planted together in the orphanage, which means "Always walk towards the light." Unexpectedly, Lin Yu imitated his method for his future revenge plan, created a live broadcast murder case, and sent Fu Ran out. At the last moment when Fu Ran was about to be shot, Lin Yu said to him, "Thank you for getting me out of the abyss." In the ending, Lin Yu found his next target.
Purpose: redemption