Kyungsoo is a single parent with a three year old boy named Do sehun or his nickname, Sehunnie.     Sehun has wanted a daddy all his life and when he annouces to the whole class that his mommy is going to have a baby and a dadd soon name Kim Jihoo and  Kyungsoo's crush kim Jongin is there to teach the kids how to dance and play games how will they both react ?