
spoilers.
honestly, if anything the final ml will probably be blond guy. this artist loves him to bits and actually changed the story to fit with his character better. even fiance does not get much (his personality and looks seem to have changed from the novel). many things changed so anything can happen at this point, but if the artist decides not to change the ml from rowoon... i don't see the point of gassing up blond guy.

spoilers.
okay, so there are a ton of names and things to remember but i won't get into that bc it's kind of complicated, but the overall reason is bc he was working AGAINST fl (and fl's twin). it's not explicitly stated he went to prison, but he confessed all his crimes to what he did to her/them. others say he's atoning for what he did and lives a rather normal life at the end

spoilers.
well, like said earlier they already changed quite a lot from the novel. in the novel, rowoon blackmails, stalks, and threatens fl, plans her death, is the type to be "if i can't have you then no one can", etc. yes, she knows (bc she obviously ends up with him, lol); the novel had multiple povs, so you get to see into their heads more (rowoon becomes frustrated (?) with himself bc he loves fl and his emotions go on the deep end so he doesn't know exactly what to do...). at first, she rejects him bc her father found out of their pining, but he doesn't know about that bit so he just continues to pursue her.
she ends up with rowoon (eeron???) who ends up being the least liked amongst novel readers even though he was a rather decent person in the beginning (he becomes super obsessive and yandere even more than the blond guy). the novel readers' favorite ml was actually her fiance bc he was the first to know fl wasn't the og. blond guy ends up going to prison along with the crazy girl (?).
people really liked it, but they didn't like the final ml and it's NOT bc he's her "brother" (they're not even related, y'all are weird); it's bc he became a crazy psycho whose love for fl was too obsessive and forced.