Queen in the Shadows

Story

This is not a fairytale. No, this is a story of what lurks beyond the “happily ever after.” Once upon a time, Elena assumed the role of Princess Veronica, married the crown prince, and lived happily... until her dutiful knight plunged his sword into her back and the true Veronica stepped out of the darkness. Now, Elena finds herself at the beginning of her cautionary tale. However, this time she intends to do more than play the star of the show. This time, Elena will direct the downfall of everyone who played a part in wronging her.

Synopsis via AniList (English).