That's 'cause those types of guys think they have all the right while their partners should be theirs only. It' s probably their way to show how superior and loved they are.
In reality, Wonho is just a piece of sht I'd voluntarily castrate.
What happened? He chose to grab his penis than hyung's hand. To get their secret off the charts he cheated on him. bought sponsor's bed sheet "both" for his stardom and hyung's sexual orientation
It's called being a born douche bag...
I wonder what happened to him to make him become so abusive.
Also I really don't understand how you can scold someone for being "unfaithful" when you are the first one doing it...