Well he was portrayed, his own chastity is the least of his problem because he needs to survive. He was picked up by a pdf to boot. In a way in today's ethics this webtoon raised so many red flags... Like how our MC did believe you can have an amazing sex even if you don't love the other person. Both him and mookyul are just broken but they fixed each other which the best ending
I didn't really think about that " about his own chastity being least problem.." but still how can it be a leat problem but when u say it I kinda of get it how it can be a least problem for seme since he was only trying to survive. Still im trying to understand why. But I guess as u said author decided his character like that. Still im just in the verse of thinking he shouldn't have let others do that to him. Well as he understood he just didnt think about his own body much. But in the end he realized or he did understand.
Idk if I am saying it correctly ah , thank you for tour explanation, I was able to think from that pov before I dint think about this way. Aaaah man I need be more understanding about these characters but ig im not psychologically smart lol aaa, bruu seriously how do get those details. I mean I did not rely think about that. Like seme's own body would be least problem since he needed to survive.
That's why our MC was mad at mookyul that he was sleeping with the person who raised him. You and MC thought that the chairman legit had a father and son relationship with him... The chairman and mookyul did not understand a normal person sentiment as they been doing it for years, it had become a norm to them, a transactional relationship, one get luxury to live and one get their desire satiated and all in spite in midst of it all the adoption been brought up. Our MC legit slapped some sense to these people... Because even his gang members did not attempt to tell Mookyul, ya know that's not normal. If you think deeper, Mookyul was groomed by the chairman... And people that were groomed at very young age wouldn't know the situation they are in until someone take them out from that situation.

Did seme and his father really did it?
I didn't Really thought he would Really have sex with his father, wasn't he just saying while he was mad? Aah pls someone i dont het it. I thought it was more likea just toy, like not something sexual. Lap dog?