Healer (2014)

A decades-old incident involving a group of five friends who ran an illegal pro-democracy broadcasting station during the Fifth Republic in South Korea brings together three different people—an illegal "night courier" with the codename "Healer" (Ji Chang-wook) who possesses top-notch fighting skills, a reporter from a second-rate tabloid news website (Park Min-young), and a famous journalist at a major broadcast station (Yoo Ji-tae). While trying to uncover the truth from that 1992 incident and a series of present day murders, they grow into honest reporters who try to blur the lines of conflict between truth and reality, even if that means fighting media honchos.

[About:]
Healer is a 2014-2015 South Korean television series starring Ji Chang-wook, Park Min-young and Yoo Ji-tae. It aired on KBS2 from December 8, 2014 to February 10, 2015 on Mondays and Tuesdays at 22:00 for 20 episodes.

Though the drama received modest ratings in its home country, it gained a fanbase overseas and made Ji Chang-wook known outside Korea.

[Source: Wikipedia]