It Turns Out That I Have Long Been Favored by the Sixth Palace.

He is a ruthless emperor who rules the world, is thrifty and loves the people, and does not indulge in women. Only once in his life did he make an exception, allowing a slave to live in the dragon's bed. She is the daughter of a wealthy merchant family, restrained and polite, reserved and shy. Unexpectedly, he was betrayed by his fiancé and his whole family was massacred. In order to take revenge, she changed her appearance and became the emperor's exclusive maid, trying her best to please him. He protected her thoroughly, delegated power to her, and doted on her with all his heart, but he was stingy in granting her status. Years later, when he got rid of the giant crocodile in the court and stabilized the country, and when her great revenge was avenged, she left decisively, but was blocked by his eight-carriage sedan at the palace gate, when the matchmaker was getting married. Only then did I realize that she had already doted on the Sixth Palace!