Choi Jung-woo

Park Jun-gi

Professor Noh

Dr. Ko

Senior Ahn / Ahn Soo-seok

Cheol-jin

Hwang Hyun-seung

Geum Jong-hwa: Sang-baek, Sang-goo, and Sang-min's 71-year-old father. He declares remarriage and operates an interior shop

Lee Taek-kyung

Tae-yi's father

Do Wan-bae, Min-ik's father (ep. 25)

Yeon Chan-koo

Jo Koo-ho (64 years old), Seok-moo's father.

Sa Jeong-do

Park Sang-goo

Heo Il-joong

Jang Min-ho: Jin-joo's father, wealthy former loan shark with elementary-school education

Seo Jin-tak

Baek Jun-sang, Baek Seok's father

Han Choong-gil

Chun Sang-won

Moon Hyung-wook

Lee Moo-yang, general manager of The Secret Hotel.

Eun Hee-jae

Kang Han-chul

Kim Gwi-do

Kang Ki-beom

Shin Kyung-soo

Ryu Jung-woo

Chun Jae-man

Park Eun

Chun Jae-man

Shin Il-shik, Ji-hyun's father

Yoo Ki-joon, In-hye's oldest brother

Kyu-tae Jang

Goo Ho-seung

Ma Sang-tae, Ma Hye-ri's father

Choi Il-doo

Park Tae-soo (father)

King Injo

Sado's eunuch