Старшая принцесса

Li Rong and Pei Wen Xuan married at 18 for political gain, with no affection between them. She used his family background to avoid disaster, and he used her royal status to establish himself. Over time, she fell into excess, while he found love elsewhere. After 20 years of a loveless marriage, they were manipulated into turning against each other, leading to their deaths. However, they wake up back at 18, before their marriage, facing the hardest time of their lives. Pei Wen Xuan seeks Li Rong again, planning to remarry, but with divorce in mind. (Source: MyDramaList) ~~ Adapted from the web novel "The Grand Princess" (长公主) by Mo Shu Bai (墨书白).