The Villiainess Is Adored by the Crown Prince of the Neighboring Kingdom
https://www.novelupdates.com/series/the-villainess-is-being-doted-on-by-the-crown-prince-of-the-neighboring-country/
Survive as the Hero's Wife
https://page.kakao.com/home?seriesId=52211789 Okay so after ch94, Oscar (the guy with white hair and low ponytail + red eyes) get amnesia ... So stop reading after that and come back later ! Here some spoilers as to why I should stop reading for some chapters (or maybe til the ends) : "Oscar wakes up, looses his "current" memories and he suddenly turns into a prick. Actually he's not the one at fault, basically the current emperess's brother is using him to take the throne from Cesar.If you haven't noticed his eyes are the same as Cesar....so yeah i think he was like Cesar's uncle or something. And now he wants the throne. ππ i miss the old Oscar ┗( T﹏T )┛ And it turns out Oscar's the legitimate heir to the throne, cause the last emperor gave his mother a ring as a sign of legitimacy, when they test both Oscar and current emperor's ring, Oscar has the real one. Meanwhile, while all this shit is happening Cesar is depressed and shocked cause everything he had done until now was all in vain. But Canaria pulls him together and now the plan of the emperor is to abdicate but he'll leave the throne to Cesar. Oscar keeps having sudden headaches cause of the lost memory. And he's interested romantically in Canaria ( ̄∇ ̄") which as you may know is not helpful in all this shitty situation"
Koushaku Reijou no Tashinami
https://www.novelupdates.com/series/common-sense-of-a-dukes-daughter/
I was Told to Relinquish My Fiance to My Little Sister, and the Greatest Dragon Took a Liking to Me and Unbelievably Took Over the Kingdom
Jishou Akuyaku Reijou na Konyakusha no Kansatsu Kiroku
https://www.novelupdates.com/series/observation-record-of-a-self-proclaimed-villainess-fiance/ https://mangadex.org/title/26359/jishou-akuyaku-reijou-na-konyakusha-no-kansatsu-kiroku
Rebirth of the Villainess: The Life of Letizia after the Engagement Annulment