The Promise Isn’t Mine

"End my life, just as you vowed." When Leyla, the revered Holy Maiden and Elena's twin sister, mysteriously vanishes, Elena, an ordinary woman, is thrust into an unexpected role: she must wed Crown Prince Kyle, known for his merciless nature, in her sister's place. Following a grim wedding ceremony, Kyle insists on the fulfillment of a particular pledge, leaving Elena bewildered.