Kim Taeyeon (you) was a typical high schooler girl who lived in Busan. What was different about you is that you don't have a boyfriend like all your other friends. They all have a boyfriend and then there is you a loner. You actually don't really care because the whole idea about being lovey dovey with someone just wasn't you, you hate the idea about acting all girly and cute just for your boyfriend to like you. So you have always been the one who got top of the class and studyed hard and got left out when your friends talk about their wonderful boyfriends. But everything changes when you get s scholarship to go to Seoul for 2 months to study and have to stay with a family, and the good thing about that is you have a girl the same age as you that lives there her name is Choi Sulli. And the worst thing is her brother who was 1 year older than both of use annoys the hell out of you, his name Choi Minho. And the worst thing of all fall in love with his enemy Lee Chan Hee or Chunji becuase that is what everyone calls him.
What happen between the three of them?