Chen Nian is a good student, and Kitano is a "bad" student in others' eyes, so it is strange that two people can come together. Chen Nian and Kitano agreed to go to college together. For Kitano, Chen Nian is a beautiful light beam on the long road of life, which has been pulling him. If it wasn't an accident, maybe the process wouldn't be so painful.
Chen Nian's classmate accidentally jumped off a building, and Chen Nian was said to be the murderer. At that time, rumors spread everywhere, and Chen Nian's college dream was ruined. In order to keep Chen Nian's dream, Kitano went to prison instead of Chen Nian. Chen Nian continued to pursue his dream of university and was finally admitted to a university in Beijing.
Later, the police investigation found that the case had nothing to do with Kitano and Chen Nian, and Kitano was also released. The first thing Kitano did after he got out of prison was to find Chennian and fly to Beijing, because he was obsessed with the agreement. Finally, the two also met. This ending is also gratifying.