Secret Door: Cast
Lee Je-hoon
Crown Prince Sado
Kim Yoo-jung
Seo Ji-dam
Yoon So-hee
Seo Ji-dam / Park Bingae
Han Suk-kyu
King Yeongjo
Park Eun-bin
Lady Hyegyeong
Kim Min-jong
Na Chul-joo
Lee Won-jong
Park Mun-su
Kwon Hae-hyo
Seo Kyoon
Jeon Kuk-hwan
Lee Jong-sung
Jang Hyun-sung
Hong Gye-hui
Uhm Hyo-seop
Min Baek-sang
Kim Ha-kyoon
Kim Sang-ro
Choi Won-young
Chae Je-gong
Seo Jun-young
Shin Heung-bok
Ha Seung-lee
Queen Jeongsun
Park Hyo-ju
Woon-shim
Kim Tae-hun
Kang Pil-jae
Jeong Gyu-su
Yang Soon-Man
Kwak Hee-Sung
Kim Moo
Jo Woo-jin
Lee Dal-seong
Kim Woo-seok
Lee Seon [Young] / Lee San [Young]
Lee Won-jae
Kang Seo-won
Kim Hyun
Jang Hwa Won
Kim Chang-wan
Kim Taek
Son Byung-ho
Kim Sung Ik
Yoon Seo-hyun
Cheon Seung Se