The Promise Isn't Mine summary: You are reading The Promise Isn't Mine manga, one of the most popular manga covering in Webtoons, Shoujo, Drama, Fantasy, Mystery, Romance genres, written by Surreuk Comics at MangaBuddy, a top manga site to offering for free. The Promise Isn't Mine has 47 translated chapters and translations of other chapters are in progress. Lets enjoy. If you want to get the updates about latest chapters, lets create an account and add The Promise Isn't Mine to your bookmark. 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.