I bet that if the manhwa adaption decided with the artist's old fanart design of Lee Hwanmae, which is manlier and closer to how Nanooh looks, they will want him as manly bottom though, lol. Perhaps due to the market, they choose the safe choice; buff top & twink bottom. This is just my speculation though.
Well this is just my opinion. If you think that there's not much differences then that's good for you yea I was kinda went hyperbolic about him being twinkizied, though maybe I meant he has become prettier.
I remember that I once found the artist's old fanart of ChangMae standing side by side, they have similar build size. Probably we will need more of manhwa scene where ChangMae in one panel so there's more materials for comparison

Are people serious wanting hwanmae to be the top he is the hottest bottom of all time do Not take this away from me if you want to see him top then just read wax doll explosion academy and stay away from my black swan