Honestly the ml is not that bad, he is loyal and stood by her side all throughout what she was going through, he find ways to fix her life too even if he says its all game, And he is quite frank in a way. He isnt like those character who pretend to be goody goody then do something horrible like the mc's husband(fickle , easy to seduce , push over). Oh and the age thing the ml did man up but to begin with he is kind of mature for a 17 year old. if its a reality 17 years old i doubt it would be a scenario like this manga.
Now the mc , she is very nice no wonder she deserves to be with someone faithful to her.
Now lets talk about other characters, the ml older brother i dont like him he looks like he is proper but is quite a nasty mf. he is like has no sense with people around him,what his actions would result to, he actually like made use of the creepy woman yes he provide her cosmetic changes (but he also made use of her like a slave) , she cooks for him/helps him take off his clothes etc and def made use of her body and now when the mc came back he did a 360 like how insensitive is that, and he knows that creepy woman loves him. Its not pity, he is another selfish mf. And the blind creepy woman is doing it for love ,talk about ruining your life in another direction (like she was very ugly and terrible past but she has to ruin it again despite being beautiful) ok, the new rival was a sad one but karma went fast to him lol the mc would never like him.
Promise Cinderella