Teacher Su was questioned by many people as a murderer, but it turns out that he is just an ordinary intern teacher, but because of his ordinary appearance and the coincidence of many things, he was mistaken for the murderer by many people. He knew nothing about that year, but he was inexplicably regarded as a criminal suspect, which was a heavy blow to his life.
In those days, only three people saw the truth. He stood up and told everything they saw. The other two girls completely lost their memory and received psychotherapy for many years after that. Everyone wants to find the truth, but the only way to know the truth is to remind those two female students who have amnesia of the past.
With the continuous efforts of everyone, the two female students finally remembered some details, and these details also made the police catch the real murderer. A vendor who was unexpectedly stimulated in his childhood wanted to get some inner satisfaction by writing letters to kill people, and killed all the people he thought were unfortunate.