I recommend "The Net King's Light Feather" to you. This book was a light novel, a doujinshi derivative novel. It told the story of the female protagonist, Oshitani, who was misunderstood before she transmigrated. Later, she became the FBI and took revenge on the princes. The female protagonist went from an angel to a demon after some changes, but everything she did was to avenge herself and her family. I hope you like this fairy's recommendation. Muah ~๐