
The way I see it is that rather than to feel better about himself, Ewon uses sex to distance himself. He uses sex (or lack thereof) to distance himself from people he cares about ie. he cheats on Jiho (so he wouldn't get too attached), he doesn't want to sleep with Dohoon (bc imo Dohoon's already his bff and geting together with him would be a real commitment), and he sleeps with other men to distance himself from the pain of being left by Mookyul. All of his hang-ups comes from his fear of abandonment. If he distance himself, he won't get attached and it wouldn't hurt when they leave him.
To Mookyul, the two most important thing is Ewon and his adoptive father. And since Mookyul already chose Ewon over his sicko dad and his wealth, and him being as obsessive as he is, there's a high probability that Mookyul won't ever let Ewon go ever again (I personally think that if Ewon didn't come back to Mookyul on the Last Episode dj, Mookyul would have dragged his ass back anyway).
But i do agree with you that people hardly changes so idk. I mean Mookyul is still connected with his perv dad so there might be a chance of relapse there if ever things with Ewon go awry

The way I see it is that rather than to feel better about himself, Ewon uses sex to distance himself. He uses sex (or lack thereof) to distance himself from people he cares about ie. he cheats on Jiho (so he wouldn't get too attached), he doesn't want to sleep with Dohoon (bc imo Dohoon's already his bff and geting together with him would be a real commitment), and he sleeps with other men to distance himself from the pain of being left by Mookyul. All of his hang-ups comes from his fear of abandonment. If he distance himself, he won't get attached and it wouldn't hurt when they leave him.
To Mookyul, the two most important thing is Ewon and his adoptive father. And since Mookyul already chose Ewon over his sicko dad and his wealth, and him being as obsessive as he is, there's a high probability that Mookyul won't ever let Ewon go ever again (I personally think that if Ewon didn't come back to Mookyul on the Last Episode dj, Mookyul would have dragged his ass back anyway).
But i do agree with you that people hardly changes so idk. I mean Mookyul is still connected with his perv dad so there might be a chance of relapse there if ever things with Ewon go awry
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I sincerely doubt the two main characters will ever be faithful to each other, or to anyone else that they'll date. Neither one had the capacity for it.