Inside Men
내부자들 (original)
A politician and a wealthy CEO scheme with a reputable journalist to create slush fund and to manipulate public opinion. They use Ahn Sang-gu, a gangster deeply involved in politics, to manage their slush fund, but Ahn Sang-gu gets caught and as a result is abandoned. Sang-gu is bent on having his revenge. On the other hand, a prosecutor is desperate to solve the slush fund case for his promotion.
Starring Lee Byung-hun, Cho Seung-woo, Baek Yoon-sik, Lee Kyung-young, Kim Hong-pa, Bae Sung-woo, Kim Dae-myung, Jo Woo-jin, Lee El, Jeong Man-sik
Watch "Inside Men" on Tubi TV released in 2015. It's a drama and crime movie, and has a rating of 7 out of 10 from Imdb which is usually fine for this kind of movie, and is currently available to watch for free.