Irene and Sehun have been really good friends. They're really good childhood friends, but what happened? Why did she suddenly disappear? He didn't know why she left and till now he still doesn't know the reason. But why did she leave? what was her reason for leaving? why did she have to leave without saying anything? They might have parted their ways but would they still remember one another. But what happens if she goes back to Korea? What would happen if they meet again? Would they remember each other?  Would she finally tell him why she left? Will he tell her what he really feels? Will she feel the same?