Akuyaku Reijou ni Tensei Shitakedo, Kekkon Ganbou Nante Arimasen!

Mizuki, an office lady who died of an illness because she married a mother-obsessed husband, is reincarnated as... the free-spirited villainous young lady, Sarah! Reflecting on her past in the original world, she had no interest in marrying a mama's boy prince, and rejected him, but for some reason, the prince fell head over heels in love with her! A turbulent love and survival tale begins, involving the queen, who is hostile towards Sarah, a rival lady, and even the real heroine! Original Webtoon