Wei Lai, the bully of Good Time Middle School, has been bullying Chen Nian in movies. She also cut Chen Nian's hair, tore her clothes and took nude photos and videos. Fortunately, the uncle upstairs dropped the bottle and said he would call the police before they stopped. Worried about Chen Nian calling the police, Wei Lai begged her not to report herself. Chen Nian had already agreed, but Wei Lai kept lying around Chen Nian. Chen Nian was very angry and pushed Wei Lai down the stairs. Unfortunately, Wei Lai was killed. Finally, Liu Beishan helped dispose of the body.

After Wei Lai's death, Chen Nian calmly took part in the college entrance examination. She just wanted to bury all this temporarily after the college entrance examination, but Wei Lai's body was still found during the college entrance examination and the police also found Chen Nian. Chen Nian refused to admit killing Wei Lai, so the police sent someone to watch Chen Nian. Later, in order to make Chen Nian have a good future, Liu Beishan took the initiative to take the blame, put all the responsibility on himself, and pretended to be a recidivist, but the police still found the flaw.

However, neither Chen Nian nor Liu Beishan was willing to admit that Liu Beishan was arrested as a rapist and murderer, but Chen Nian finished the college entrance examination and scored more than 600 points. Originally, she had the hope of entering the university, but later Chen was tricked into going to Beishan by the police and was sentenced to death. Chen Nian, who could not escape the inner condemnation, surrendered himself, and Liu Beishan was not released. His previous behavior also got him sentenced. Four years later, Chen Nian was released from prison and should have been involved again.

At the end of the film, there is a scene of the college entrance examination paper, and the time marked is 20 15, which happens to be the time when Chen Nian is released from prison. Therefore, Chen Nian should have gone to college. After graduation, she became a teacher and protected a girl who was suspected of being subjected to school violence to go home. Liu Beishan was also released from prison. He no longer has to hide from the camera, but walks behind Chen Nian aboveboard to protect her.