Moon River S01E05 - Walk a Mile in My Shoes

Dal and Gang wake up having swapped bodies and are both shocked. Gang tries every possible way to get into the palace, and eventually, with the help of the Queen Dowager, enters the Crown Prince's quarters disguised as a eunuch. They attempt to recreate the situation from before their bodies were swapped, but no matter how many times they try, they cannot return to their original state.