It's a joseon period 1842, Moon Junhui is a son of Left State councilor, a minister if the king. Junhui is noble scholar who always go to the book store and courtesan house. He's not having fun in the courtesan house, he has a secret why he's always in the courtesan house.

You're a noble lady daughter of Minister of war, your family is Kim clan. Most powerful clan in joseon

It's just a normal day, Scholar Moon is in the bookstore, and you're also there to buy book "the great learning"