Hwi-Hyeon bought the Original House of Yun-Gyeong & gave back the house to her. They are doing the deed in the living room. Yun-Gyeong is very active during the sex, Hwi-Hyeon is fucking her Rough & Hard.
Flashback: Hwi-Hyeon saw Yun-Gyeong having sex with her Husband when he was a Teenager. Both saw each other & it turned her on even more.
Drunk Miss Jung goes to Jinsoo. Ji-Ah joins them. Joo-Ah and Jaeyeon hears them and barge in. They continue despite gitting caught. Joo-Ah joins them while Jaeyeon packs up leaves the house.