Do-hoon reveals his true identity to Ye-eun (his other bully in high school) making all her fears come true. So, she tries to silence him by offering money & a sincere apology but that's not what interests our MC, so obviously he wants to have his way with her in a meeting room using her filmed bullying acts projected on the room wall as a threat.
Do-hoon is more motivated than ever to take revenge. So, he set his eyes on completely taming his bully's mother (Lee Sohee). In a dark office room at night at their workplace, Do-hoon promises that It'd be their last night together, so he goes hardcore on his boss by putting her on a leash and enjoying a steamy night taming her and turning her into his bitch.