Yn, born healthy but neglected by her family in favor of her weak twin sister, Yena, leaves home at 18 to start a new life. She finds love but discovers her boyfriend cheating on her with Yena. Her family sends her to her aunt's house, where she is sold to the mafia king, Taehyung. Despite his cold demeanor, Taehyung marries Yn, and they develop a deep, possessive love.
20 parts