Kang Seulgi is a kind, positive and bubbly girl. She's very pretty but no one notices her. Well, I can't say no one.. Someone did notice her, but all of the sudden he left her. She doesn't know why. Just one day he told her goodbye and didn't even bother to explain why. 

"atleast he said goodbye." "I'm over him." Her besfriend Irene has heard this from words from Seulgi too much that it started to sound so cliché. 

Deep inside her, she knows she's still not over him.

Lee Taeyong. The heartthrob. Every girl's dream boy. A very cool, handsome and smart guy. And his cold expression makes the girls go crazy for him. Despite his cold looks, he's actually a very warm and caring person. Tsundere, as what they call it in japanese. You may think he's a playboy but he's not. He actually only been inlove once. But for some reason, he chose to leave her. 

Jung Jaehyun. The other heartthrob. Vice-President of the student council and a top student. He's nice to everyone he meets. Oh, and he's Lee Taeyong's bestfriend. While Taeyong's known for his cold looks, Jaehyun is the exact opposite. He's sunshine embodied. He's very warm and very bright. His deep dimples when he smiles will make anyone melt.