After Sun-Young misses a proposal deadline and gets Ho-Jun reprimanded by his superior, he takes punishment into his own hands. During overtime, he spanks her and orders her to wear a vibrator for a full day.
Naeun becomes Siwoo's little bitch. Her master orders her around anywhere, anytime whether it be the in the classroom, in the streets, in the restroom. He explores his slave's exhibitionist kinks and fucks in the restroom at Christmas eve.
Siwoo takes peeks at Naeun filming racy content for her secret account in an empty lecture room, he later raids the room and protects her from getting caught. When the strangers leave, he makes a bet with her, and if she loses, Naeun becomes his slave for life.