Yi San is a breathtaking series about the life and reign of Yi San, the 22nd monarch of Joseon, who took the name King Jeong Jo upon his ascension to the throne. He made many reforms during his reign. He did away with all the old traditions of status being considered of greater worth than intelligence and morality, he repressed the wealthy ministers' customs or bribery and suppression of the people, and he allowed illegitimate children of noblemen to hold high government positions, a first in Korean history. Today, King Jeong Jo is regarded as one of the best monarchs of Korea, ranking along with King Sejong, the inventor of hangul. This series also tells the story of the great love between the king and Sung Song Yeon, a young girl with a talent for art. They had been friends since childhood, and in the end, Song Yeon becomes a royal concubine, Lady Sung.