page 24 , jin shi says : gao shun , restrain her so i can shove this ( my semen ) inside her mouth and down her throat .
then its stinky smell makes her vomit non-stop , lol .
i dont read the web novels and the light novels , so everything below are not spoilers , they are just my guesses / assumptions , so they could be wrong :
so i guess this rakan guy is mao mao 's real dad .
i guess the courtesan was dead when she gave birth to mao mao , and the eunuch doctor felt responsibility that he couldnt save the courtesan so he adopted mao mao .
i guess the courtesan was probably the best girl of the brothel of the granny , and her death caused the granny a great loss of money , so the granny considers mao mao to be her precious property , and she tries to train mao mao to become her best courtesan , because she thinks "like mother , like daughter" .