该剧根据墨书白小说《长公主》改编。故事中，大夏朝的长公主李蓉与当朝首辅裴文宣梦回华年，由仇人变闺蜜，闺蜜变成有情人。他们彼此信赖，彼此成全，终于破镜重圆，一起搞事业，一起发现真相，一起发现爱。
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Li Rong and Pei Wenxuan married at the age of 18. Li Rong used Pei Wenxuan’s family background to avoid disaster, and Pei Wenxuan used Li Rong’s identity as Princess to establish himself. They married for political reasons, without the slightest bit of affection. Later on, she lost herself in the midst of wine, song and dance. As for him, he had a home yet did not bother coming home because he already had someone in his heart… Husband and wife for 30 years, yet nothing between them but power. In the end, it was hardly surprising that someone turned them against each other, leading them to die under each other’s schemes. However, when they woke up, they had actually returned to the year when they were 18 years old, returning to the most difficult time in their lives. So Pei Wenxuan went to look for Li Rong. To be married again but with divorce in mind.
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Salen chispas cuando la poderosa princesa regente de la gran dinastía Xia, Li Rong, se ve obligada a casarse con el primer ministro Pei Wen Xuan. Este matrimonio de conveniencia está lleno de animosidad y sospechas, no de amor. Después de tres décadas de tensión y maquinaciones palaciegas, ambos mueren de manera prematura. Sin embargo, ambos renacen, con sus recuerdos intactos, como sus yo de 18 años. Decididos a corregir los errores del pasado, trabajan juntos para frustrar la conspiración que una vez los destruyó. Mientras navegan por estas aguas traicioneras, ¿podrían surgir chispas de romance?
