Jung Yunho is a charming and matures behave man compared to his younger brother from another father, Shim Changmin whom more bright person but sometimes can be childish too.  Seohyun is Yunho's girlfriend since a long time but unfortunately, their relationship doesn't flow smoothly as Yunho and Changmin's childhoods friend, Victoria comes to their life. When Changmin's potent secret disclosed, everything becomes more complicated. In the end, they had to know their own sense to make every single thing put in a place.