His personal name is Yi Yung, the legitimate son of King Seongjong. He is pale and slender, with features as beautiful as a woman's. Though patient and calm in the early years of his reign, he turned into a tyrant after learning the truth about the death of his biological mother, the Deposed Queen Yun. He deeply cherishes his primary wife, Lady Shin. In history, his final wish before dying in exile was to see her.

The great-granddaughter of King Sejong the Great and granddaughter of Grand Prince Imyeong. She is Yeonsangun's second cousin and the Queen of the nation. In the original history, she was deposed and exiled alongside her husband. She possesses a gentle nature and is a wise mother and good wife who treats even her subordinates with respect.

The eldest daughter of Yeonsangun. Her personal name is Yi Su-eok. Born in 1491, she is 11 years old in 1501. She will marry Gu Mun-gyeong in 1502 at the age of 13, so she still lives in the palace. In history, she lived a life of luxury but was forced to divorce after her father's deposition due to her father-in-law, Gu Su-yeong, though she eventually reunited with her husband.

The second son of Yeonsangun and Queen Shin. Born in 1500, he is the fourth child as of 1503. He was the son Yeonsangun loved most, but due to his frail health, he spent much time recuperating outside the palace. After Yeonsangun was deposed in 1506, he was exiled and subsequently executed by poison.

Consort Suk-yong of the Jang clan, a concubine of Yeonsangun. Known for her youthful appearance and flirtatious behavior, Yeonsangun was never angered by her antics and found them pleasing. He fell for her after visiting Grand Prince Je-an's house and took her as a concubine. She will give birth to a daughter, Yi Yeong-su, in 1502.

The wife of Grand Prince Wolsan, who was the son of Crown Prince Uigyeong and Queen Sohye. She is currently looking after Yi Go.