Li Jia Le

To protect her eldest sister, Yue Ling, the Youngest Princess of Dongyu, was married into the country of Beishuo. However, she married Zhou Shi Yu, the North Prince of Beishuo, not one that was originally intended for. The trip to the Capital City of Beishuo was full of repeated assassinations, but they were saved when a mysterious jade pendant activated the Time Gate, allowing Yue Ling and Zhou Shi Yu to be repeatedly reincarnated and improve themselves from striving to change their destiny to shouldering the national cause. During this time of growth, they fell in love. (Source: WeTV; edited by MyDramaList)

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).