You really must be super slow if you really the manga itself is trying to make you feel bad for the seme in anyway, some of y'all had forgotten the aspect of how one doesn't have to sympathize with the actions of a character to try and make them likeable by some sort of development no its not that at all..you completely missed the part where the seme genuinely admitted he was an awful person because of his childhood but more importantly because he was taught from a very young age that that was his way of doing things and that he could never change, he was basically stuck with the fact that he was a creepy persona... That did not mean AT ALL that we should sympathize and feel bad for him its our choice.
The manga made it clear he's bad person that may have a chance to change but his actions are unforgivable so let's just hope the best for him but likewise he still deserved that slap from his father(and his father deserved a slap too)
Really hated the aspect of how it was shown that we should feel bad for seme. Cause no matter what he is a piece of shit. I liked the manga. And i liked the fucked up aspect but you cannot try to make me the reader sympathise with that human garbage.