Responses
let me introduce you to the porn trope/tag that is ugly bastards. The top is deliberately made to be a stereotypical faceless ugly fat man who assaults the pretty mc. This species can be typically found within, but is not limited to, the wilds that is Japanese hentai.
I believe they don't serve any greater purpose than fulfilling the fetish that is seeing a hottie be degraded (and most of the time raped) by someone unattractive. And well, it's supposed to be a sort of self-insert too for the 4chan gooners with sense of self worth.
SO YEA. We live in a horny society.

first off, im not supporting transphobia or fatphobia by any means. but i feel like yall shouldnt drag the fatphobics in the comment (the transphobes absolutely deserve it) because the fatphobia is in the manhwa itself. i feel that the top is purposely made ugly. i came with expectation that 'finally a real plus size person in a bl manhwa that looks hot, isnt 'wholesome' or 'fat but actually buff' trope' and lo and behold he doenst have a fucking face or the body of how fat people actually look like. and i assure you, its not the artstyle because the bottom looks just fine as muscular. but a faceless fat top? a generic, low effort circle for a body and he remains faceless the entire story? whats the point of that.