The esteemed Grand Imperial Minister Lu Shuyu was assassinated by malicious individuals operating from the shadows, plunging the world into crisis. Unexpectedly, seven years later, he is reborn in the body of his "lunatic" younger brother, Lu Ziyin. Despite this peculiar situation, Lu Shuyu is pleased to learn that his most pampered young pupil, Crown Prince Song Zhao Xing, has ascended the throne as Emperor. Lu Shuyu is very happy to know that his work as a Laoshi has paid off. However, one day he is stunned to hear the Emperor's scandalous decree: a vast array of handsome men are summoned so the Emperor can choose a male concubine. "A male concubine?! How could my disciple be attracted to men? I must have made a mistake in his upbringing!"