고등학교 1학년 때 친구 세 명 중 한 명이 사고로 죽고 나머지 둘이 어른이 돼서 우연히 만나면서 벌어지는 일을 그린 영화.
Sun-joo is busy preparing for her upcoming wedding. But her fiancee Ji-hoon plans to go on a business trip with the beautiful writer So-ra who turns out to be Sun-joo’s best friend from before. With all the doubts and jealousy she lies to So-ra and accompanies her in place of Ji-hoon. But on their way she realizes that the memory about their dearly friend Yeo-eun who died in a tragic accident are quite different. What really happened to them? Can they reveal the untold truth?