Kim Ji-hoon (actor, born 1981)

Park Tae-woo

Do Won-jun, who gave up his dream of becoming an actor to start a management business and guided Nam Kang-ho's career

Denver / Oh Taek-su

Himself

Baek Hee-sung Choi Kwon-soo as young Hee-sung

Tae Min-ho, youngest son of Tae Byeong-cheo, designated successor to head Geosan

Lee Kwang-jae

Han Joon-hee / Jang Min-jae Nam Da-reum as young Jang Min-jae Moon Woo-jin as child Jang Min-jae

A man in the mall (Ep. 1)

Jo Dong-jin

Lee Jae-hwa Jung Yoon-seok as young Jae-hwa

Kang Tae-wook

Oh Jin-rak/Oh Jae-won, an attractive, yet stubborn webtoon artist who is in love with Dok-mi.

Kim Hyung-do, inspector of the Saheonbu, senior 6th rank.

Won Kang-ha

Prince Daeryangwon, later King Hyeonjong (Wang Uk and Empress Heonjeong's son) Kim Jin-woo, Kang Soo-han, Choi Soo-han as young Prince Daeryangwon

Lee Bok-su

Choi Shi-wan

Kyung-gu Kim Myung-jae as young Kyung-gu

Young Gil-sang