Ye Anan, Han Qianhui, Zong Qiyu, and Li Jongxuan are four good friends who grew up together. An accident took the life of Li Jongxuan. Before his death, Li Jongxuan chose to donate his organs. In this accident, Ye Anan and Zong Qiyu made an engagement but became the most familiar strangers. Han Qianhui left the United States with complicated emotions.
Three years later, Han Qianhui came to X University as an exchange student. In order to give herself the courage to continue to love, Han Qianhui began to pursue Zong Qiyu. Ye Anan accidentally discovered Xu Yixuan who accepted Li Zhongxuan's heart, and Ye Anan began to get close to Xu Yixuan.
In the interaction between the four people, the truth about the accident three years ago is slowly revealed, and the secrets hidden in everyone's hearts are gradually revealed. Between love and friendship, fantasy and reality, how should the four choose?