Fu Qingnian returns to the day of her grand wedding with a heart full of regret. In her past life, she misplaced her trust in the hypocritical Prince Jing, Jun Heng, resulting in the destruction of her family, only to realize that the emperor, Jun Ye, had been silently protecting her all along. Returning through rebirth, she tears apart conspiracies, purges internal traitors in the harem, and protects the Fu family. Unexpectedly, she discovers that Jun Ye has also returned with memories of his past life. With a tacit understanding, the emperor and empress share one heart, moving step by step to expose the secret of Prince Jing's birth and crush his plot of treason and colluding with the enemy. Wiping away past misunderstandings, resolving two lifetimes of blood feuds, they join hands to guard the rivers and mountains for tens of thousands of miles, finally attaining year-after-year devotion and a fulfilling life.