The sexy guesthouse owner, and a friend's innocent girlfriend?! An intoxicating cohabitation among four people is about to begin! This is the guesthouse that Mi-kyung runs alone. University students Dong-jun and Jeong-su are staying there. One day, Eun-ju, Jeong-su's girlfriend, shows up at the guesthouse unannounced. Dong-jun can't sleep because of the Jeong-su couple making love right next to him. Dong-jun, envious of his friend, faces the temptation of Mi-kyung, the sexy guesthouse owner...