Suddenly, as her sister's friend Jung-hee lives at home, Sang-woo's daily life changes 180 degrees. Every time she sees Jung-hee wearing only one big box tea with her wet hair scattered, Sang-woo falls into a strange imagination. One day, when he dreamed that if he had done it once, he would have no wish, Sang-woo spends a night with Jung-hee that he will never forget. But after that day, Jung-hee, who has not forgotten Sang-woo, who is much bigger than her fiancé, begins to visit Sang-woo's room...