A shadowy society known as "Golden Cross" dominates the Korean economy and marketplace with its deep connections and financial power.

Prosecutor Kang Do-yoon gets entangled in their dealings when one of their plots gets his beloved sister murdered, a crime for which his father then gets framed.

Yi-re is a righteous and truth-seeking prosecutor; she grew up respecting and obeying her father, and her life is thrown into disarray when she discovers his dark side.

Meanwhile, Seo nurtures a protegee, businessman Michael Jang, whose greed and ambition soon makes him challenge his mentor for the top spot.

Park Si-hoo was originally considered for the role of Michael Jang, but continuing public outrage regarding his sexual assault case in 2013 led broadcaster KBS to cancel his casting.