Shin Hye-sun as Queen Kim So-yong
She is the 25th queen of the Joseon Dynasty who has the soul of a man in her body.
She uses her skills from her other body, Jang Bong-hwan, to bring modern delicacies back in time to get the favour of the Grand Queen Dowager.
Everyone says that she has a peculiar behavior because she speaks using the modern Korean slang which involves words that the people in the Joseon era do not understand.
Kim Jung-hyun as Lee Won-beom, King Cheoljong
He is the 25th king of the Joseon Dynasty, with a "Jekyll and Hyde" personality and has many secrets. He seems like a figurehead, who is gentle and easygoing. In fact, he hides his strong aspects.
He is afraid of dying without doing anything for the citizens, as an ineffective king, as others wish. So, he secretly prepares for reforms.
He is a man who is determined to restore justice in the palace and he also cares about the health of his citizens.
Kim Kang-hoon as young Lee Won-beom
Chae Seo-eun as Hong Yeon
She is Queen Cheorin's loyal maid who served her since they were kids. Like Court Lady Choi,
she is devoted to the Queen and is also willing to risk her life to protect the Queen. She has feelings for Hong Byeolgam.
Chae Seo-eun as Hong Yeon
