
Some of those questions are answered in a side story about Sangchul http://www.mangago.zone/read-manga/totally_captivated_dj_mr_sangchuls_diary/

For the first question, I would just say it's really hard to leave someone you felt "saved" from. When your parents basically abandon you, whoever takes you in is basically your lifeline- or at least that's what I think.
And isk the chairman has been a shallow character all this time I don't even want to deal with him :/ a pedo is a pedo so he's obsessed and bc he needed a heir he adopted him I guess
I was having a tough time understanding the reason Mookyul was going with it. I just couldn’t fathom the reason Mookyul willingly went to bed and still had affection for the old pedo.
I guess I understand a bit of how Mookyul’s brain works now. He is conditioned to think that this is how he is supposed to show his affection & gratitude for his ‘father’, by going to bed with him. So basically he is segregating his feelings for Ewon and the pedo into different compartments. His ‘love’ for his ‘father’ is gratitude & his love for Ewon is that of a lover. He gives sex to the pedo in return for his position, standing & the fact that the pedo gave him a place to belong. The important word is ‘gives’. While he ‘has’ sex with Ewon which includes his sexual satisfaction. The important word here is ‘he himself has’.
But a few questions still remain unclear:
Why does Mookyul abandon Ewon so easily when Ewon wants him to choose when he is obviously obsessing over Ewon?
What are the old pedo’s reasons to make Mookyul his whore?
And how can the old pedo so easily make Mookyul his adoptive son after obsessing over Mookyul for years? Has the old perv gotten over his obsession?
Can’t help but wonder...