Following her father's murder, a revenge-driven woman puts her trust in a powerful crime boss — and enters the police force under his direction.
Yoon Ji Woo, the member of the organized crime ring who goes undercover as a police officer and harbors cold revenge in her heart. Choi Moo Jin, the boss of Dong Cheon Pa, the biggest drug ring in Korea. He helps Yoon Ji Woo go undercover through various methods, but his true motives are not easy to read.
Jeon Pil Do, a police detective in the Drug Investigation Unit. He is a stickler for rules who becomes Yoon Ji Woo’s partner when she joins the police. Cha Gi Ho, the team leader of the Drug Investigation Unit. He and Choi Moo Jin have long been enemies, with Cha Gi Ho vowing to take down his crime ring before he retires.
Jung Tae Joo, Choi Moo Jin’s subordinate in the drug ring. Because of his steadfast loyalty, he is Choi Moo Jin’s most trusted henchman. Do Kang Jae, a former member of the drug ring. After causing problems and getting kicked out of the gang, he vowed revenge against them.
Whatever gets the job done. Bong Sang Pil grew up living the gangster life, full of tough physical fights and evading the law. When his mother dies a tragic death, he is determined to avenge her death. Sang Pil becomes a lawyer and begins to go after people with absolute power who think they are beyond the law. With the cunning and skills from his previous life, Sang Pil uses both his fists and legal loopholes to amass an impressive winning record.
Ha Jae Yi is a young lawyer who believes the law is sacred and fights for justice. But her license gets suspended when she hits a judge over an unjust ruling during a trial. Jae Yi ends up going to work for Sang Pil so that she can continue to pay off her father’s debts. When Sang Pil and Jae Yi get involved in a case that involves Cha Moon Sook, a senior judge who wields a great deal of power, and Ahn Oh Joo, a former gangster who is now the CEO of a corporation, can they figure out a way to beat the most powerful people in the city at a very dangerous game?
Park Dong Hoon is a middle-aged engineer who is married to attorney Kang Yoon Hee. However, his life is not that happy as he has two unemployed brothers, Sang Hoon and Gi Hoon, who rely on him. Moreover, his wife is secretly having an affair with CEO Do Joon Yeong, Dong Hoon's college junior but current boss.
One day, Dong Hoon receives an unexpected bribe and notices that his co-worker, Lee Ji An, saw him. Ji An is a young part-time worker at Dong Hoon's company who is drowning in debt and left alone to take care of her ill grandmother. Dong Hoon then gets entangled in his brothers' struggle to get back on their feet and the company's internal rivalry between the company's CEO and the people opposing him, all the while not knowing that CEO Joon Yeong wants to get rid of him and Ji An is working for the CEO.
Jin Hyun Pil runs ‘One Network Inc.’, a company with an extensive network covering Korea. The chief of the Intellectual Crime Investigation team, Kim Jae Myung, suspects One Network’s involvement in a fraud case of unprecedented scale.
Kim tracks down the company’s IT architect and brain, Park Jang Gun, and attempts to persuade Park to hand over Jin’s secret ledger in exchange for a plea bargain. Feeling the police close in on him, Jin moves operations out of Korea. Kim nonetheless continues his investigation into Jin. 6 months later, news about Jin’s death stirs the country once again.