Young-soo goes to the rooftop to smoke, and sees Eun-young, a student in front of the laundry. Young-soo puts emotions of love in her heart in the shape of pure Eun-young. Eun-young has a school meeting, so she asks one in front of her to take the goods, and Eun-young goes to say thank you to Ha-na on her way home. Amazed by the moan through the porch, Eun-young opens the door to her curiosity and sees Ha-na and Young-soo having sex on the sofa, and feels a strange feeling. He stutters his body unknowingly. From then on, he suffers from the sound of sex in his head... Meanwhile, one of the winners of the 4-person family pension tells Eun-young, who is in front of her, to go to the pension when it's time. Thanks to Ha-na, Young-soo, Eun-young, and Jae-suk go on a trip and have a very sweet