Oh Hayoung has a tiny crush on her high school sunbae, Oh Sehun. After she debuted in Apink and Sehun debuted in EXO, she managed to become friend with Heechul, who is a part of Super Junior and also a sunbae of Sehun. With Heechul trying to match the two of them together, will they fall in love or will they stay as strangers like before?