The Night Owl

Ryu Jun-yeol

Cheon Gyeong-su

유해진

King Injo

Choi Moo-seong

Lee Hyeong-ik

조성하

Lord Choi

Park Myeong-hoon

Man-sik

Kim Sung-cheol

Crown Prince Sohyeon

Ahn Eun-jin

Consort Jo

조윤서

Crown Princess Kang

Lee Joo-won

Seok-cheol

김예은

Court Lady Seo

Jeong Suk-won

Captain of the guard

Ryu Sung-hyun

Senior physician

Kim Seung-tae

Vassal 1

신문성

Third Royal Secretary

안성봉

Envoy of Qing Dynasty