May reveals a very harsh truth to Su-Heonover a sextape they watched together: Lee Dae-U had set-up his wife Yu-Mi to be brutally raped by Jae-Geun after drugging her, with everything being filmed. While watching the tape, Su-Heon started mimicking Jae-Geun actions & applicating them on May.
Yu-Ri leaves her husband alone for days to be at her parent's home to clear her head. She had called Yu-Mi in advance to take care of him in the meantime. Su-Heon takes the opportunity to make advances on her.
Su-Heon watches Jae-Geun grinding his dick against his wife's ass in what seems like a Doggystyle position through a hidden camera the Dae-U had set up. He rushes there to take her home all dunk & horny ready to be banged. Mid sex, in a way to awaken his cuck gene, he commands his wife to scream Jae-Geun's name while banging her roughly.