I mean Hoyoon was not an idol originally. He was a cutthroat PD whose every project has a high rating. Got cursed, de-aged and now has to make the group he’s in to be a massive hit to get back to his original life. Also, the reason he’s such a sadist is because he chose to be the bad guy to make sure he earns enough to provide for their family, which is only him and his younger brother. It doesn’t excuse his behaviour, but it gives context.
Also, which manhwa are you referencing? I would like to read it!
Drink sweets like a diabetes machine, used to smokes like a chimney, teases and prank people just for the fun of it, no fear of using dirty tricks to succed
Iwol will be wary of hoyoon but hoyoon will force a relationship if it benefit him. I think iwol will join hoyoon trash talk club if they ever met. Since both of them have certain aligning value, i think they can somewhat respect each other's boundary. They just wont be close friend.
Hoyoon being villain is somewhat debateable since he's only actively malicious toward bad people while it depend on his mood with everyone else lol. Bby needs to relieve stress by becoming a prankster once in a while

Kim Iwol is an angel compared to this man plus the fact that he does things that go against Iwol's 10 commandments for idols. The fact he also used to smoke he'd beat (nag) his ass jf he were the one who saw him. This guy would be the villain in kim Iwol's novel bro