Dong-jun, who lives with his mother Si-yeon. His mother's friend, Yu-min, who visited often when he was young, comes to the house. After her divorce, she lives with her, who has nowhere to go. Dong-jun, who feels the young Yoo-min he saw as a child, as a woman, and Yoo-min, who doesn't think of his nephew, Dong-jun, as a man. Yu-min shows off her underwear without hesitation, and Dong-joon, who was hurt by such a figure, finally confesses to Yu-min seriously... Yu-min just laughs at how cute he is. Si-yeon brings her lover into her house to remarry. Yu-min, who is heated by the love between the two, remembers Dong-joon, who had no idea what to do with his lewd appearance, and seduces him…