Full Time Servant

Xiaoyao was a servant—a full-time servant. Due to the demands of his profession, he had to be proficient in nearly every kind of skill, whether scholarly or martial, refined or vulgar, even those that couldn’t be spoken of in public. And just in case, he had to keep studying and honing his abilities every single day! At the same time, since his early teens, he had been cultivating his future boss, guiding her step by step onto the path of becoming a peerless powerhouse! — Description from novelcodex.org