In a certain place, a teenager named Do Kyungsoo, knows a little black magic. He has an annoying classmate whom he hate so much. Due to his deep dislike, he casted a curse on him. A curse in which, Park Chanyeol, will slowly lost the thing he loves the most. Few days pass by, Do Kyungsoo falls ill with a mysterious sickness he can't seem to get rid of.

They curse at him and call him a bad guy. They said that we will end easily. To break up or to end things with him, please don't tell me to do that.

Falling in love with a devil is a sin that can never be forgiven.  Falling in love with an angel is a love that will never be accepted. If the two fall in love, a punishment must be taken. The other will remember but the other will forget.  And this is a story of a fallen angel who never stop loving.

Kyungsoo hate kids but Chanyeol love kids. What will happen to their married life?

If only, I wasn't selfish then I wouldn't lose you.

Kyungsoo never show what he feels. Chanyeol broke up with him because of a bet.