he wanted the person to walk in on them and see the red head was forcing himself on taesung.
To frame the other guy to look like he was being forceful ( which he was)
He’s trying to make that guy look like a rapist
So he would make it look like the red hair guy was Harassing him and frame him
To get back at him I think, since mr yoon stepped over the line and brought the boyfriend thing up again even going as far as to try and have his way with taesung. I think he realized that instead of resorting to violence and getting in trouble himself he would go with what would have happened if mr yoon was able to get his way and someone walked in on them
To frame so called Mr. Yoon bitch, whose trying to break taesung and our cute baby haebom relationship...
Oh i understand now, thank u to everyone who explained
Wait someone pls explain to me why taesung did that cuz im confused af