An art student named Gwang Ho gets dumped by his girlfriend because she was only his source of comfort, and that he's a Mama's boy and a premature ejaculator. He tries to avoid seeing her by going to a different academy and that's when his mother introduces him to her friend Soo Yeon, a sophisticated and intelligent looking woman. Gwang Ho falls for her. Gwang Ho's mother suddenly leaves for Australia because his father is sick and Gwang Ho gets to stay in Soo Yeon's house for a few days. Looking at her, he thinks of all the things he would like to do with her and Soo Yeon's niece Ha Kyeong stimulates him to do something about his feelings. One day, Gwang Ho finds out that the man in the background of Soo Yeon's phone is his father and finds a picture of his father in Soo Yeon's work room while having sex with Ha Kyeong. He asks Soo Yeon about her relationship with his father. Soo Yeon tries to hide it saying that she has a crush on him but in the end, she tells him the truth. Gwang Ho packs his bags and swears to tell his mother about it but Soo Yeon begs him not to and that she'll do anything for him. So, he asks her to help him become a man by becoming good at sex...