Read manhwa The Promise Isn’t Mine / 약속을 한 건 내가 아니야 “Kill me, as you promised.” When her twin sister Leyla, the Holy Maiden, suddenly disappears one day, the ordinary Elena finds herself having to marry Crown Prince Kyle, a man infamous for his ruthlessness, in her stead. After a dreadful marriage ceremony, Kyle demands that a certain promise be fulfilled, to Elena’s confusion.