Graduation is coming up and the seniors of SM High are just about ready to get out of there and start their life. For one particular person, they aren't so happy to leave. Kim Heechul, a senior, is just one of the many people that want to leave. On the other hand, Kim Yesung, Heechul's younger brother, a junior, doesn't want his brother to leave. The yongest of the Kim brothers, Kim Kibum, wants to cheer his brother up. The middle Kim brother, Yesung, is starting to get depression but doesn't want his family to find out. The Kim's seek the help of Yesung's long time crush to help him. How will they do it? and Will Yesung be able to get over his depression? Who is this mysterious guy that Yesung likes?