My Eldest Sister Stole My Betrothal. I Rule Beside the RegentEpisode 3

Her fiancé faked face blindness to trick and marry her elder sister, dooming her to a lifetime of humiliation and a miserable death. Reborn on their wedding day, the female lead rewrites her fate! She abandons her worthless ex-lover and marries the powerful, awe-inspiring regent instead. Cutting off all foolish misplaced affection, she watches coldly as her betrayers fall into endless regret. Protected and cherished by the mighty regent, she embraces a brilliant, free new life.