Daisuki datta Konyakusha ni Miryou no Mahou no Sei de Konyaku Haki saremashita.

Sina, the daughter of a prestigious family, was living her happiest days, engaged to the second prince, Riley, who deeply loved her just as she loved him madly. But suddenly... everything shattered before her eyes. Riley, who once promised her a life full of love, now faces her with cold eyes, saying, "I've fallen in love with another woman." And that other woman? She wasn't ordinary at all... She was Imogen, a stunning beauty, holding in her hand a mysterious glowing ring. With every move of that ring, Riley would whisper words of love to Imogen, as if completely under her control. Realizing that nothing about this situation was normal, Sina finds herself alone, heartbroken, and standing against a magical conspiracy that stole away the love of her life. But... will she give up on her heart so easily? Or will she fight with everything she has to reclaim the one she loves? (Source: Libre, translated)