I. Synopsis
When his older brothers Yangnyeong and Hyoryeong fail to impress their father King Taejong, the king makes a royal command for Choong-nyung to become the next ruler of the kingdom instead. The prince, who strongly refuses to become the king and just wants to live a happy and stress-free life buried in his books, chooses to escape the palace before his coronation ceremony.
After hours of contemplation, Choong-nyung escapes by climbing over the palace wall. There he runs into a bad-tempered drunken slave named Deok-chil, who happens to be at the palace to save the love of his life who was captured by government officials and put in prison for being the daughter of a suspected spy.
Deok-chil perfectly resembles the prince, so Choong-nyung instantly grabs the chance to disguise himself as a slave and they exchange clothes with each other. In a terrible twist of fate, when Choong-nyung wakes up after being knocked unconscious, he is mistaken for a slave and Deok-chil gets put on the throne. As Choong-nyung ventures outside the palace walls, he begins to open his eyes to the people living in extreme poverty and experiences the life of the common man.
