There were many novels in which the female protagonist transmigrated into a book that had a female supporting character. 1 << Reborn Female Supporting Character >>: The story of the female protagonist, Ye Yun, who was an ordinary college student before the apocalypse. She accidentally transmigrated to a world of doomsday novels and became one of the female protagonists. Together with the female protagonist, they experienced the struggle of the apocalypse and the struggle between life and death. " Reborn Female Supporting Character: The Evil King's Concubine ": It was about the female protagonist Bai Suzhen, who was a supporting character in an ancient Xianxia novel. She accidentally transmigrated to another world and became one of the female protagonists. They experienced various adventures and challenges together. 3." The Poisonous Daughter of a Concubine ": It was about the female protagonist Xue Qingtong, who was a supporting role in an ancient romance novel. In an accident, she transmigrated to another world and became one of the female protagonists. Together with the female protagonist, they experienced various complicated court struggles and entanglements between families. 4 " Female Supporting Character Is Not a Demon ": The story of the female protagonist Mo Yu, who was a supporting character in a modern cultivation novel, accidentally transmigrated to another world and became one of the female protagonists. Together with the female protagonist, they experienced various cultivation and cultivation adventures and challenges. The above are some of the more popular novels where the female lead transmigrated into a female supporting role in a book. I hope it will help.