Heungmagui Eorin Huwonja

Princess Daphne helped her brother, the male lead, become the crown prince to ensure her own happy ending. However, her dream is shattered when she is killed by that very brother! In the next moment, Daphne somehow wakes up as her 13-year-old self again. Vowing to destroy the one who wronged her, she decides to become a patron for Archduke Bertrund, the story's archvillain, and have him carry out her revenge. But will Daphne be able to get the ending she wants with a villain's assistance?
(Source: Tapas)