Seulgi has just moved into a new city with hopes of keeping his biggest secret away from the people around him. He's a cool guy who's very competitive, but has great sportsmanship, and is very kind to the others around him - unless you get on his bad side. He's very organized and aware of his surroundings, for example, when he analyzes the students in school and chooses which person would be his closest friends or not.

His new high school is a school that he would never be prepared for. It's full of jocks, preps, nerds, and also students who resemble the paparazzi. Here, he meets many different people and becomes popular and well-known to the whole school in no time.

One of those many people that he meets is a girl named Bae Joohyun, but is known as Irene in school. She is currently a senior and she is known as the great, beautiful girl who practically owns the hallways she walks in. She's not your typical, cocky, or very outgoing popular student. She's shy, and she likes to keep to herself most of the time, unless she knows the other person very well, like her best friend.

These two meet each other in their wonderful high school, and their love story unfolds.