Xie Yanzhi, the seventh prince of Dayin, whose mother and concubine died young and had no power, resorted to "lying down on salted fish" to avoid trouble in the palace, and just wanted to sleep in peace and eat custard buns. Unexpectedly, in an accident, the palace maid mistakenly thought that he was the mastermind behind the scenes, and actually activated the "Behind the Scenes Master Development System" - as long as someone thinks that he is the operator, they can earn points and redeem skills.
From being jealous of the emperor for being "very wise and foolish", to being misunderstood by the prince for "keeping it secret", to scaring off his political opponents with the words "the tea is cold", Xie Yanzhi's salty fish routine has completely gone astray. With the support of the system, he defeated assassins and won military exploits while sleeping, and was even regarded as the "Sleeping Dragon Prince" by the people.
But tranquility is never the main theme: the prince merges with ancient evil spirits to become the ultimate villain, the Beidi army presses the border and is in emergency, and the mysterious shadow pavilion hides murderous intent. Forced to "do business", Xie Yanzhi, with his systematic skills and reliable teammates, complained about the unfair fate while overcoming misunderstandings and dangers, growing from a peaceful prince to a pillar of the country.
When the emperor wants to appoint him as his heir, the country and Xianyumeng come into conflict. Can he use his "ruling by doing nothing" skill to protect the country of Great Yin while also keeping the laziness and purity in his heart? This journey of developing a mastermind that started with a misunderstanding will eventually lead to an unexpected ending.
