Han Minjung’s life turns upsidedown when a little four year old boy tugs on her leg on the street and calls her “umma.” Next thing she knew, Minjung is wrapped up in a complicated scheme, pretending to the girlfriend of the boy’s charming, young single father, who she may or may not be falling in love with. This is definitely going to be a holiday to remember!  

Do Kyungsoo sees the world in black and white, with a place for everything and everything in its place. That is, until he meets the obnoxious Kim Joonmyun.