It's not about revenge, but rather getting to the bottom of the truth - they have a complicated past, which both of them will gradually work through - and both of their character development takes place - towards the perception of each other and more towards themselves. Soohyun's desire to control every aspect of eunsung's life using this situation with munseop is his way of keeping eunsung next to him (a place that isn't the top) -
Sex here is not to show their romance but the physical and mental control they have on each other - it will be a catalyst to break down the walls between them, which have been too many since before.
Revenge isn't central to the story at all, it's about un-shackeling each other from their pasts - trauma and all that came with it. Even though eunsung is perfect in soohyun's eyes, he realizes that he's actually not that lucky or his life isn't perfect, and he appears in eunsung's life at a time when he was unbelievably stuck - and eunsung also sees soohyun for who he is. Still we can't say yet because the story is ongoing, but soohyun and eunsung have definitely changed a LOT now so maybe not revenge.
Also their romance is a slow burn for very many reasons - it is super super interesting and subtle how their feelings change. It's not one of those cheesy super predictable yaois who focus on the smut and not on the plot or the character development. ヾ(❀╹◡╹)ﾉ~
Thank you for explaining (◍•ᴗ•◍)
Hehe you're welcome~ it's an awesome story, but the translations really fuck it up. Have fun reading! (The mature versions are better! And not for the sex parts lol)
Tbh I see this going no where how is he going to get revenge on him is the biggest question in the whole entire story but all I mostly know is that there’s some sex scene and it’s not really an romantic love type of story