Sohn Hyun-hee

Ju-yeon and Seong-tae's decade-long best-friendship comes to a crashing halt one night after they sleep together. The shock of doing the deed subsides, reality sets in, and the two decide to get married.

Sang-eun is a beautiful 20-year-old girl who is mentally challenged. One day she happens to meet a boy and deludes herself to think he's a beast under the vicious spell.