Shim Changmin has been dealing with heartbreak for a while when he meets a girl going through the same experience. He decides to befriend her, but there's a problem. He's a teacher, and she's his student. As they get closer, he's afraid their friendship might develop into something he shouldn't be involved in. 

"What if I end up falling for Saemi? I can't like a student!"

Will his job be jeopardized? Would Saemi like him back? 

Changmin will experience a one-sided love for the first time... and it's with someone seven years younger.