Hyun-Woo (Yong Joon-Hyung) is a webtoon writer. He is popular and handsome, but he is not nice to people. Hyun-Woo also does not believe in love. His trainee is Seul-Bi (Kim Min-Young). She is cute and chubby. Seul-Bi has had a crush on Hyun-Woo for a long time. Yet, she has never told Hyun-Woo about her feelings. One day, Seul-Bi drinks coffee and she suddenly finds herself changed into a beautiful woman. She names herself Oh Go-Woon (Chae Seo-Jin).
