As a poor student, he goes to school during the day and works part-time at night. His only motivation is to watch his charming neighbor Yu-san every day. Every time he comes home late from work, he meets Yu-san, who asks him questions while she wears extremely sexy clothes that reveal her cleavage, making him unable to take his eyes off that sensitive spot. He often watches adult movies and thinks about having sex with her one day. One time, while watching a porn movie, he accidentally heard her scream. He quickly ran over to help, and this time, what caught his eye was her exposed breasts that were not properly covered. He couldn't control himself, so he took the initiative to ask her for sex. At first, he was shy and afraid that his husband would find out, but because of her lustful nature, she responded fiercely.