

By Dramabeans
Lee Jung-sub, Kim Jin-woo
Song Ji-na
20
60 minutes
KBS2
South Korea
Korean
Source: Wikipedia
Seo Joon-seok, Jung-hoo's father, an engineer of the illegal radio station and later a photographer working with Oh Gil-han.
Jo Min-ja, Hacker Ahjumma, a former detective specializing in cyber crimes.
Seo Jung-hoo / Park Bong-soo / Healer Park Si-jin as young Jung-hoo Go Woo-rim as child Jung-hoo Choi Jung-hu as toddler Jung-hoo
Kim Moon-sik, one of the initial five friends, now a highly successful CEO of a news agency. Son Seung-won as young Moon-sik, driver of the truck from which the five friends ran their illegal radio station.
Chul-min, a former convict and one of Chae Chi-soo's clients who now works at the café.

Oh Gil-han, Young-shin's biological father, one of the lead reporters in the illegal radio station and a regular reporter after the fall of the Fifth Republic.
10-year-old Ji-an
Chae Young-shin / Oh Ji-an Kim So-yeon as young Young-shin Shin Soo-yeon as 10-year-old Ji-an Park Ji-so as 8-year-old Ji-an Ku Geon-min as 5-year-old Ji-an
Young Myung-hee, one of the lead reporters in the illegal radio station.
Choi Myung-hee, Young-shin's biological mother, living in the present with Kim Moon-sik and using a wheelchair. Jung Hye-in as young Myung-hee, one of the lead reporters in the illegal radio station.
Kim Moon-ho Kim Seung-chan as young Moon-ho Lee Woo-joo as child Moon-ho
Bae Sang-soo, head of a rival "night courier" agency.
Park Jung-dae, "The Elder", a shadowy figure operating behind the scenes and the CEO of Omega Holdings formerly known as Omega Venture Capital.

Hwang Jae-gook
Kim Jae-yoon (cameo, ep. 20)

Young Moon-sik, driver of the truck from which the five friends ran their illegal radio station.

Kang Min-jae, news director at "ABS News", where Kim Moon-ho works at the start of the story and also his love interest.
Lee Jun-bin
Ki Young-jae, Jung-hoo's teacher (and the first "Healer"), one of five friends from the past. Choi Dong-gu as young Young-jae, Motorcycle rider and distractor during the illegal radio broadcasts.
Chae Chi-soo, Young-shin's adoptive father, a lawyer specializing in defending clients accused of burglary who also runs a café where he has employed many of his former clients.
Yoon Dong-won, a detective specializing in cyber crimes, formerly Jo Min-ja's hoobae.