The Letters S01E20

IU

Go Hajin / Lady Hae Soo

Lee Joon-gi

Wang So (4th Prince)

Kang Ha-neul

Wang Wook (8th Prince)

Hong Jong-hyun

Wang Yo (3rd Prince)

Baekhyun

Wang Eun (10th Prince)

Nam Joo-hyuk

Wang Baeka (13th Prince)

Kim Ji-soo

Wang Jeong (14th Prince)

Yoon Sun-woo

Wang Won (9th Prince)

Kim San-ho

Wang Mu (Crown Prince / 1st Prince)

Seohyun

Princess Woohee

Kang Han-na

Princess Hwangbo Yeonhwa / Queen Daemok

Jin Ki-joo

Chaeryeong

Z.Hera

Park Soondeok

Sung Dong-il

General Park Soogyeong

Kim Sung-kyun

Choi Jimong / Homeless Man

Jo Min-ki

King Taejo

Kim Kang-il

Shincheon Kang

Park Ji-young

Queen Yoo / Queen Shinmyeong

Park Jeong-hak

Wang Shikryeom

Woo Hee-jin

Court Lady Oh Sooyeon

Park Si-eun

Lady Hae Myeong

Jung Kyung-soon

Queen Hwangbo / Queen Shinjeong

Choi Byung-mo

Park Younggyu

Lee Ho-jung

Aera