At the age of 17, Pu Yu went to Baiting Town to join his grandmother, and unexpectedly became roommates with Yuan Su, a genius boy who was at a trough. The two young people's hearts illuminated each other at the cramped desks in the small town, and they made an appointment to pass the exam together and go to the ideal university in the small town. But when the college entrance examination came to an end, Yuan Su left a piece of letter and disappeared quietly. Pu Yu took the two of them to the campus with their agreement, waiting for him to meet again for a long time.
