Jin Ki-joo as Chae-ryung, Hae Soo's maid and friend Sung Dong-il as General Park Soo-kyung, Soon-duk's father and 4th Prince Wang So's right-hand man Kim Sung-kyun as Choi Ji-mong, the King's astronomer Choi Byung-mo as Park Young-gyu, 3rd Prince Wang Yo's father-in-law Woo Hee-jin as Court Lady Oh Nam Sung-joon Lee Chae-min