Yoon-yeong failed her university entrance exam twice. Her mother provides her an English tutor since her grades do not improve as expected. However, the tutor goes to Yoon-yeong’s mother, Hee-jae, and then Hee-jae’s younger sibling, Yoon-joo, likes the youthful and handsome tutor. Eventually, Yoon-joo plans to seduce the tutor, Yoon-seong by making her sister and Yoon-yeong leave the house. The tutor knows how Yoon-joo feels, but he still keeps on thinking about seeking Hee-jae…