Transmigrated Into a Book as the Legitimate Older Sister’s Wingwoman

After witnessing a murder, Yan Shu is mercilessly killed by the murderer. She transmigrates into the novel she was reading before her death, becoming the Yan family’s second-born daughter from a concubine. To save her own life and rescue the beautiful Grand Princess, she goes all out to support her legitimate elder sister, Yan Zhi, who has been reborn and returned to seek revenge.