The first victim, Yan Qilin, was a high school graduate at the time. She was shy and introverted. She usually liked to read books alone. After the murder, the police investigated three people.

The first was Xiao Ran[1], a classmate and best friend of the deceased. The two had known each other since they first met during military training in their first year of senior high, and they had been inseparable ever since. Xiao Ran had found a diary when she was sorting out the victim’s belongings. She took the initiative to give it to the police. The diary mentioned that the deceased and Xiao Ran had fallen in love with the same boy at the same time, but afterwards Xiao Ran removed herself from the situation of her own volition. For this reason, the deceased often felt like she owed Xiao Ran and treated her doubly well...