Kobutsu Ha Kossori Kakushite Hara No Naka
I Don’t Want To Be Duke’s Adopted Daughter-in-law
The typical plot, girl "saves" (grooms) the poor mistreated kid, so that she won't die in the future or for pity. Insert rich and doting father figure who has a rivalry with the kid for the mc's attention. Insert the girl making plans to leave cause the kid is supposed to be happy with the OG female lead. I expect her either to attempt to leave but getting caught and resolving everything (unlikely) or actually leaving and then there's this like 7 year gap where the male lead finds her and has become a crazy obsessive yandere
I'm Mediocre but I'm Loved in a Different World
Nokori Mono niha Fuku ga Aru
They keep calling her virgin when they're doing it day and night lmao. Also honestly I don't think the story would've changed if she was in her 30s, which would still be a pretty big age gap but definitely better than the current one. She could've been someone who didn't have time/will to take her of herself so that the king refused her instead of having a 60yo commenting disgusting shit about a young sportive girl becoming "pale, thin and sexy"
Snow White no Doku ni Somu