Er Jia Cheng Xiang Cheng Le Zhang Xin Chong

Song Yao transmigrates into a novel as a widow and is caught mid-elopement. The man destined to become the empire's most feared chancellor is currently a sickly youth, so she attaches herself to him and sets about earning his favour. She earns rather more than she planned for — and then he wakes with the memories of a life already lived.