Yeogang High School, one of the top and richest schools in Seoul, previously had only three floors until one more floor was added in the South Building, especially designed for Class D with only drop-outs in the family as students.
The class that was always looked down upon changed when a girl was transferred just a month after school re-opened in the beginning of third year.
The class that was always full of guys changed when a girl was transferred.
What is a girl to do in a class full of boys and better yet labelled as "delinquents"? But then again she had an awful past of her own that she wanted to bury. There is a leader of the class, Yoon Doo Joon, who is lazy and likes to sleep most the time who also is her seatmate. What happens when he befriends her?
This story revolves around Han Seul Mi who comes across friends, rivals and enemies. She goes through emotions both happy and sad. Join Seul Mi in High School and experience what friendship, love and heartache is.