Hyungsik as your ex-husband, suddenly, Hyungsik was bored as he cheated on you that's it when you left him. Hyungsik cheated on you on your own best friend known Mina as they got a child.. until, one day, Mina couldn't handle taking care of the child as Mina left him leaving Hyungsik and the child alone

One day, your sister who was a elementary teacher was sick as she sent you to be the children's teacher for only today. As you were sitting on your sister's desk, Hyunsik's son entered but you didn't recognize his child since it's been 7 years.