In his third year of high school, the sunny and handsome Mu Qingcheng transferred to the No. 1 Middle School in City A. In the new school, he fell in love with the girl Xu Jingwen. As the college entrance examination was approaching, Mu Qingcheng had to return to the place where he studied to take the college entrance examination. When they parted, they made an appointment to go to the same university, University C. However, Mu Qingcheng passed by University C because his parents tampered with the college entrance examination application form. Mu Qingcheng was angry and gave up admission to Tsinghua University and chose to join the army. When she learned that Mu Qingcheng was going to join the army, Xu Jingwen went to join the army despite her family's objections. They happened to be assigned to the same military region. Although they couldn't be together often, they knew that the other party was by their side. On the eve of his retirement, Mu Qingcheng died during a military mission. He was only 22 years old at the time.