Main •
Jo Jung-suk as Cha Dong-tak / Gong Su-chang :Cha Dong-tak: A dedicated and fierce detective in the violent crimes unit, who is serious and inflexible in life; but possesses an awkward and endearing charm. :Gong Su-chang: A skilled con man who tricks people with his sly techniques. •
Lee Hye-ri as Song Ji-an :A determined and feisty rookie reporter trying to clear her late father's name. •
Kim Seon-ho as Gong Su-chang :A con-artist whose soul inhabits Cha Dong-tak's body.
Supporting •
Lee Ho-won as Dokgo Sung-hyeok :A fellow detective who trusts Cha Dong-tak with all his heart. He is from a rich family and likes to brag about it, but he's also smart and a positive thinker. •
Lee Si-eon as Yong-pal :A bar owner who is known for his knife skills and loyalty. •
Moon Ji-in as Gil Da-jung • Kim Young-woong as Park Dong-gi :A detective who is a troublemaker and mood maker. He is loyal and constantly seeks justice. • Kim Seo-kyung :Song Ji-an's friend. •
Park Hoon as Tak Jae-hee •
Choi Min-young as young Jae-hee :A prosecutor who is Ji-an's friend •
Oh Eui-shik as Lee Ho-tae •
Jung Hae-kyun as
Senior Superintendent Ma Jin-kook • Ryu Tae-ho as Noh Young-man •
Choi Il-hwa as Tak Jung-hwan •
Lee Dae-yeon as
Captain Yoo Jung-man • Lee Jae-won as Lee Doo-sik •
Im Se-mi as Ko Bong-sook •
Ryu Hye-rin as Miss Bong •
Lee Jin-hee as Woo Hye-in the widow of detective Cho Hang-joon, former partner of Cha Dong-tak. • Kim Myung-seon as nurse • Yoon Bong-kil as Dokki, Yong-pal's minion
Special appearance •
Kim Min-jong as Jo Hang-jun (ep 1–2) •
Park Jin-joo as nurse Song Gyung-mi(ep 3) •
Choi Won-hong (ep 7–9) • Min Sung-wook as Manager Park(ep 8–12) •
Ji Il-joo as Kyung-chul (ep 14–16) •
Jo Woo-ri as Min-ah (ep 13–16) •
Jang In-sub as Jo Min-suk (ep 22-) ==Production==