Yoon Doo-joon

King Yi Do

Kim Seul-gi

Jang Dan-bi

Jin Ki-joo

Queen Sohyeon

Ahn Hyo-seop

Bak Yeon

Im Ye-jin

Dan-bi's Mother / Queen Wongyeong

Kim Kap-soo

Dan-bi's Father / Hwang Hui

Jeong Gyu-su

Sim On

Lee Dae-yeon

CSAT Supervisor / Choe Man-li

Ko Kyu-pil

Math Teacher / Chief Eunuch