Song Hyun-wook
Baek Cheol-hyeon, Jung Hye-eun, Song Ja-hoon
16
70 minutes
JTBC
South Korea
Korean
Source: Wikipedia
Cheon Woo-jin, Im Hyeong-rak's subordinate (ep. 2 & 8)
Chu Dong-woo
Choi Yeon-soo Han Sun-hwa as young Choi Yeon-soo
Min Sang-ah, Choi Yeon-soo's best friend in college, and a political reporter for a major media house Han Bo-bae as young Min Sang-ah
Han Seung-goo
Jung Cheol-hoon, a passionate detective
Lee Min-yool (ep. 3-4)
Oh Pil-jae
Kim Tae-yeol
Do Yeong-geol, Han Jeong-hyeon's former senior at the National Intelligence Service, formerly Agency for National Security Planning Park Doo-sik as young Do Yeong-geol
Han Jeong-hyeon/Lee Suk-kyu Yeon Woo-jin as young Han Jeong-hyeon/Lee Suk-kyu
Cha Min-ho's wife
Young Ko Yoon-joo
Han Seung-mi
Im Hyeong-rak, director at the National Intelligence Service
Young Han Jeong-hyeon/Lee Suk-kyu
Young Choi Yeon-soo
Bae Goo-taek
Lee Man-ho
Young Min Sang-ah
Song Mi-seon
Kim Do-hee/Ko Yoon-joo, an undercover agent Park Gyeong-ree as young Ko Yoon-joo
Kang Choong-mo, Choi Yeon-soo's good friend in college, now a high ranking government official working at the Blue House Hong Jin-gi as young Kang Choong-mo
Kim Myung-jae, Secretary General of the Blue House