I Am the Villain (Sejji)

Working hard is supposed to take you far - but into the world of your best friend's novel? For Lucy, being whisked into a life of ballrooms and picnics isn't exactly what it's cracked up to be; at least, not when everyone has mistaken her for the villain flagged for death. To escape this fate, Lucy must transform from modern workaholic to high society schemer if she even has a chance at returning home. Will she make it? Or will this world of beautiful outfits, strawberry desserts, and dashingly handsome gentlemen seal her fate?
Source: Webtoon