I Didn't Know My Sister Was the Male Lead

'''Jiang Wen Yin has transmigrated into a book. In the book, she is the sister of the male lead's white moonlight, a cannon fodder dedicated to making trouble for the male and female leads, and ends up with a tragic fate. Considering the male lead's cruelty, she decides to stay away from the plot's characters. But the timing of her transmigration is a bit off—the original host and her white moonlight sister have just lost their family, escaped from exile, and to get rid of her burdensome sister, the original host is about to sell her off. Just after waking up, Jiang Wen Yin saves her sister on a whim and, being a sucker for good looks, takes extra care of her white moonlight sister. Duri...