My Pure-Hearted Master Became the Villain Because of Me

She transmigrated into a novel as the villainess—and her biggest mistake? Corrupting the story's most beloved character. Her master, once the purest "white moonlight" figure everyone adored, is spiraling into darkness... and she's the one who pushed them there. Every promise of devotion, every vow of unconditional love—she twisted them all. Now the plot has derailed completely, and she's desperately searching for a way to undo the damage. But there's one problem: her master still wants to give her everything she desires. And what she desires now might be the most dangerous thing of all.