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.
Do-hoon, So-hee and Da-som all go on a business trip together. while preparing for the seminar in a empty room the MC pounces on his boss So-hee promising it'll only be oral sex to then breaking his promise and having it all the way.