"Teacher, I just turned a little over thirty... Isn't it too cruel to tell me to let go and just wait for the day I die?" Park Hyun, who had been overwhelmed with work, hears bad news at the hospital he went to with his long-time girlfriend Cha Jung-yoon, who is worried about his health. After receiving a terminal diagnosis at the university hospital he visited to confirm his illness, Hyun begins to prepare to leave the side of his beloved girlfriend and friends. And on a night in April when cherry blossoms were falling. "Let's break up." Hyun tells Jung-yoon that they should part ways. He leaves the home they shared and disappears to prepare for his death alone. 'If faded memories become our last, what will you do when I leave and you're left alone?' Hyun let Jung-yoon go because he wanted to end things while leaving only good memories behind. 'Right now, I just desperately wished to see you.' But Jung-yoon, cherishing everything about Hyun, refused to let him go. In the end, Jung-yoon finds Hyun, who was dying alone in the hospital, and dedicates herself to him. Even though Hyun pushes her away several times, he ultimately couldn't help but accept her because he loved and cherished her too much. As death gradually approaches Hyun, the two sense the impending moment of farewell and begin to build memories one by one.