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"Eunho, you're... like an angel, a guardian angel." Two childhood friends who were each other's number one priorities for 15 years, Seohui and Eunho. To call it friendship is, well...there's something between the two of their relationship that no one else can interfere with. Friends, family, soulmates, lovers(?), they kept switching somewhere in between all those, but suddenly, Seohui broke the news, "Eunho, I don't want to see you anymore." Those words made Eunho's world fall apart. I can't act oblivious any longer. I'm crossing the solid line which has been drawn by time. Before you disappear from my side. Before I lose you.
Oh Eunsoo and Min Jaeha are madly in love, but Jaeha's best friend, Ji Geonwook, is appalled that the two are even together. After putting up with Geonwook's rude behavior, Eunsoo tells Jaeha that she wants nothing to do with his pal. But after an unexpected accident takes Jaeha's life, the one to bring her up from the dark depths of despair is none other than Geonwook. Eunsoo thought that she had nothing but hatred for him, but could he be the one to make her see the world in color again?