She died on her birthday. Now, a system offers her one chance to uncover the truth — in a world that was never meant to be hers. Lydia’s life ends abruptly on the day she was meant to celebrate it. No answers. No clues. Just darkness… until she wakes up face to face with a mysterious system. To learn the cause of her death, she must step into the world of an unfinished isekai novel — a realm of magic, danger, and twisted fates. Her mission? Ensure the male and female leads, destined for heartbreak, find their own happy ending. But nothing in this world plays by the rules. The story resists change. And the closer Lydia gets to the truth, the more she begins to wonder: Is she rewriting their ending… or uncovering the beginning of her own?