Set in the 1970's, Baek Gi Tae is an ambitious man, who thirsts for wealth and power. Jang Gun Yeong is a prosecutor with animalistic instinct and fearsome tenacity. Facing a major incident, Jang Gun Yeong throws his everything to stop Baek Gi Tae. The people around them include Lobbyist Choi Yu Ji, Investigator O Ye Jin, Bae Geum Ji and Chief Secretary Cheon Seok Jeong.