Full cast of The First Night with the Duke

Seohyun

Cha Seon-chaek / K

12 episodes

Ok Taec-yeon

Prince Kyungsung / Lee Beon

12 episodes

Kwon Han-sol

Cho Eun-ae

12 episodes

Seo Bum-june

Jeong Su-gyeom

12 episodes

Chi Hae-won

Do Hwa-seon

12 episodes

Lee Tae-seon

Prince Seonghyeon

12 episodes

Seo Hyun-chul

Cha Ho-yeol

12 episodes

Yun Yoo-sun

Yoon Deok-jeong

12 episodes

Lee Sang-un

Cha Jang-ho

12 episodes

Kim Shin-bi

Cha Du-ho

12 episodes

Yoon Jung-hoon

Cha Se-ho

12 episodes

Song Yeong-jae

12 episodes

Ju Seok-tae

King Seoljong

12 episodes

Nam Kee-ae

12 episodes

Jung Hee-tae

Do Bae-myeong

12 episodes

Jung Ho-bin

Jeong Moon-seok

12 episodes

Kim Young-woong

Cho Byeong-mu

12 episodes

Kim Ah-young

Sul Gi [Shaman]

12 episodes

Choi Hyeon-jin

Yi Beon [Teen]

5 episodes

Su Hyun

[Seonmun club member]

2 episodes

Jung Jung-ah

Madam Jeong (Eps 3)

1 episode

Ban Hye-young

Seller (eps 9)

1 episode