Lin Jia at the age of seven years old became a companion to the nine year old crown prince. The main reason was because Wang Liu wanted his companion to be younger, shorter, and thinner than him or at least that is what the crown prince had told everyone expect his emperor father.

“The Little Crown Prince’s companion turned such a massive and beautiful courtyard into a lousy farm.”
“If you are not careful your tongue will be cut off by order of the little crown prince for insulting his little companion transformation of the courtyard.”

[Labeling for future chapters. Mature scenes between Wang Liu & Lin Jia will not occur until Lin Jia is eighteen years old.]