The brother and sister were once the children of the emperor's most beloved concubine, but after a conspiracy, all the mother and concubine's family were beheaded, and they were exiled to a barbaric land. After several years of painful wandering life, they finally met the general who came to rescue them. With the help of the general's faction, they were welcomed back to the palace. They originally wanted to live in peace with the world, but unexpectedly, their father died suddenly, and his sister was almost killed. He finally understood that giving in was futile, and he had to ascend the throne for his sister! He already knew that even if the world was destroyed, the only love he wanted to save was his sister, but he still had no choice but to marry her to someone else...