Chi Yangyang got up and got out of bed, and turned to the few case materials in his hand. Who on earth would hit his parents so hard two years ago?

After opening the documents, there are no other clues except for the documents proving the identity of the parents...

Chi Yangyang has always known that it is difficult to find the murderer. After all, two years ago, he did not find any clues about the murderer. What's more, two years later, he still feels worried every time he sees blank information.