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In her previous life, she was a wealthy princess of a country, and he was the only son of the prime minister's family known to everyone. Once the country fell, the reason was that the emperor's half-brother, in order to win the throne, collaborated with the enemy and rebelled against the country. Unexpectedly, he was met with a rebel general from the enemy country. When her country was ruined and her family was in ruins, she found the legendary half-immortal man and paid a free price for the annihilation of the enemy country. After hundreds of years, the former only son of the Prime Minister's Palace suddenly became the fearsome Tabei Demon King. First he severely punished those who had bullied her, and then secretly found her reincarnation and silently helped her. In the end... He was still not satisfied, so he transformed and became her chief disciple!