Being eighteen has its ups and downs, but when you get older; you would realise that it doesn’t mean anything. But it will still remain as part of a precious memory. 

Kim Jonghyun spent the past five years of his life regretting everything he did to break his first love, Onew's heart. But can he do anything to win his heart back when his first love is getting married?

I just wanna go home. Cause I miss you so much. 

Where Key goes back to Daegu for the holidays and Jinki / Onew who annoys him to no end during the train ride.

In which Key is sort of oblivious to his feelings. Until he has to leave.