Lee Kikwang is the resident shy boy of Gwangsan High School. He's only been there for less than year, but his big glasses and fairly quiet disposition lead most people into ignoring him, including Jeon Hyosung.  Jeon Hyosung and her gummy smile are well known throughout her school. Most people don't even have to talk to her to take a liking to her. They just have to see her smile. A natural leader, she is very popular, as she knows many people, and vice versa. She knows people from class, and if not from class, she knows them dance class, if not from there, from the various clubs she is a part of and even heads. She knows so many people, you would be surprised that she doesn't know Kikwang, her new next door neighbor.  But Kikwang knows her. He, like many, was not immune to Hyosung's gummy smile and he fell. But being the shy boy he is, no one knows of his feelings except for his new friends, Yang Yoseob and Lee Joon. They've tried to encourage him, but Kikwang's still shy, so he didn't do anything. Until now. It's nearing the Christmas season, and Hyosung and Kikwang's class is doing Secret Santa. Kikwang finally gets a chance to win Hyosung's affection through this secret gift exchange. Question is, will it work?