It's Christmas Eve and Joomnyeon wants to do something serious. 

Na Bi was so used to avoid what she didn't like, pretending that sweeping it under the rug will make it disappear. She could get by just fine, until she could not. Joon Myeon was so used to facing the problem head on, trying to tackle everything on face value. A chance encounter with an old Sunbae brought him to realization that sometimes, going through leeway and deception are necessary. The lady who avoids bumps, and the man who fights it.

When Minseok was getting married within a week, Chaesook decided she needs to do something before his marriage and let him know her feelings. And that was with the help of Minseok’s younger brother, Joonmyeon. But plans just don't turn out right sometimes. It just don't.