The story of ardent love, friendship, betrayal, and loyalty between Joseon's King Seongjong, his wife Yoon So-hwa who was later stripped of her title, and their childhood friend Kim Cheo-sun who grew up with them though he was of a lower class.
Why did they become eunuchs? How could they castrate themselves? What did they live for?
Through this drama, the deeply moving stories and the self-giving lives of the veiled Eunuch Department of the Joseon Dynasty are revealed!
In history, Kim Cheo-sun was considered the best eunuch attendant in the Joseon Dynasty. In this drama, the hero bears the same name. Kim Cheo-sun secretly loves So-hwa, whom he met in his childhood, but he cannot fulfill his love because of the difference in social class. Eventually, when the woman he loves becomes betrothed to King Seongjong and enters the palace, he castrates himself and enters the palace as a eunuch in determination to protect her. In historical dramas, the eunuchs of Joseon are always portrayed as shadows of the king, but none have actually focused on the eunuchs' lives that have much sorrow and joy. "The King and I" presents the convulsion of the political situation in Joseon after the 1453 Purge of Prince Su-yang, the lives of the women of the royal family that were sacrificed in the intense strife among the factions, and the tale of the Eunuch Department that delicately permeates the lives of the royal family.