It is the era of Joseon, the era of kings and crown princes, the difference between classes. Our heroine is from the middle class, working as a doctor. One day, the Crown Prince, Kim Taehyung, fell ill with poison from his brother who covets his position, so they asked for a doctor to treat him, and it was you. You entered. To see how big and perfect the palace was, you entered the Crown Prince’s room and saw its miserable condition