The male protagonist Mu Xu'an met a girl who made his heart beat when he was in junior high school - Luo Yuyi
After the college entrance examination, Mu Xu'an became a doctor, and Luo Yu'an finally couldn't hide his love. When he found Mu Xu'an's hospital, he was told that Mu Xu'an had died fighting the epidemic in City A a month ago. Before leaving, he left three suicide notes, one for his family, one for his friends, and one for Luo Yu'an.
Intention: secret love