A mysterious woman named Jung-min moves in above Sung-chul and he can't sleep every night due to the noise. She brings home a different man every night and she thinks Sung-chul is pathetic. One day, Sung-chul is having sex with his girlfrieng So-hee when he hears his new neighbor having sex upstairs. Furious, Sung-chul goes up to complain, but Jung-min is with another man and she yells at Sung-chul...

Min-chul misses his mother who left 5 years ago. His father Jung-soo brings Hyun-ah, a new mother who looks just like his mother. He recalls his mother as he watches Hyun-ah endure the violence his father shows, but he starts to see her as a woman.

The thrilling and suspicious cohabitation of a young and sexy aunt and a lustful MZ college student begins. Tae-hoon, who has been accepted to college in Seoul, comes to the city imagining his college life by himself but becomes disappointed when his mother calls him to stay at her friend Kyeong-sook’s house. However, he is delighted when he sees the middle-aged woman Kyeong-sook’s young and sexy body, so he happily settles in. While imagining sex with his mother’s friend, who has fair skin and seductive eyes, Tae-hoon, who comes home early, witnesses the mature woman performing an adult broadcast in her room and relieves his sexual desires by watching her stream. However, Tae-hoon gets worried about how to deal with Kyeong-sook and confides in his friend Min-wook, who suggests using her broadcast as a weapon to have sex with her.