Not to be confused with the 'doppelganger Kim Min-seong' which is actually Jack Choi from sex scenes chapters 68-69 & 72-74. This sex scene (chapter 71) is the 'real' Kim Min-seong who was tied up on chair which is Ha Lina's husband.
Gangchan wants to learn some workout exercises from Seyoung but that takes a weird direction. She then pounces on him while he was still asleep. Gangchan wakes up to Seyoung being on top of him, and then SHE FUCKS THE SHIT OUTTA HIM.