Kang Ha Neul has turned over to the dark side in his brand new JTBC drama series, 'Insider'. 

Premiering next month on June 8, 'Insider' tells the story of a legal apprentice who goes undercover to investigate corruption within the judicial system. But during his investigation, the apprentice becomes involved in a major crime and is thrown in prison. There, he takes on the role of an 'Insider' and begins a dangerous survival game in order to exact revenge.

Kang Ha Neul will be leading the series as the legal apprentice Kim Yo Han, a man who refuses to give up even when he loses everything. In the main drama poster, Kang Ha Neul faces the camera with his two faces - one as the meticulous legal apprentice Yo Han, and the other, as the vicious inmate Yo Han.

So which is the real Yo Han? JTBC's 'Insider', also starring Lee Yoo Young, Heo Sung Tae, and more, premieres on June 8 beginning at 10:30 PM KST.

You can also check out a special teaser for Kang Ha Neul's 'Insider', below.