Kyung-min is an English tutor who is often pressured by his lover Seon-hee about getting married. He starts giving lessons to a new student Young-won, a piano tutor, and they decide to exchange tutoring like barter. Unlike Seon-hee, she seems to be an untied person when it comes to relationships, which strongly attracts Kyung-min. But as he falls for her, he faces unexpected but familiar situations.
| Actor | Role |
|---|---|
| JJames ChungKyung-min | Kyung-min |
 Yuha LeeYoung-won | Young-won |
 Jeon Han-naSeon-hee | Seon-hee |
| SSon Joon-youngSeok-cheol | Seok-cheol |