Sister-In-Law, Let Me Treat Your Illness

In the dead of night, my sister-in-law knocked on the door with a red face: "Secretary, my sister-in-law's back hurts, please rub it for me..." The whole village laughs at me for being stupid, but I have the inheritance of a medical sage, can bring the dead back to life, and can make a lot of money every day. During the day she protected me, but at night she only came to me for "treatment." Ruffians come to your door? Kneel down with a needle. Are the powerful looking for trouble? One punch until she disowns her mother. Everyone laughs at me for being a stupid king, but they don't know Silver needle in hand, beauty in arms, this day has just begun. My sister-in-law blushed and asked, "How many secrets do you have?"