Oh Ha Young, a cheerful girl.She have 5 bestfriends that ChoRong,BoMi,EunJi,NaEun and NamJoo.They call them self are Apink.They also friends with SuHo,LuHan,BaekHyun,Kai,Chen and SeHun. The story is begging when Hayoung start had feeling with her Senior. Hayoung trying to reach out to that senior. Since that, the senior was changed and fell in love with Hayoung.  At the same time Sehun love Hayoung. One day Hayoung heard the conversation between Sehun and Luhan. Sehun is diagnosed with brain canser. Hayoung shocked to hear the news. Since that Hayoung always be there for Sehun. What is the outcome of this story? Who will be Hayoung choose?