Main •
So Ji-sub as Han Yi-han •
Yoo Seon-ho as young Han Yi-han : Once a genius double-board surgeon specialized in
general surgery and
cardiothoracic surgery, but now a
lawyer specializing in
medical litigation. •
Shin Sung-rok as Jayden Lee : Asian branch manager of Honors Hand, a company that specializes in
lobbying and
investment. •
Im Soo-hyang as Geum Seok-yeong •
Shin Soo-yeon as young Geum Seok-yeong : A
prosecutor in the
medical crime division of the Seoul Central District Prosecutors' Office.
Supporting Banseok Foundation and Hospital •
Lee Geung-young as Gu Jin-gi : Chairman of Banseok Foundation and Director of Banseok Hospital. He is a candidate for
Minister of Health and Welfare. •
Lee Joo-bin as Lim Yu-na : Director of Banseok R&D Center. • Lee Dong-ha as Gu Hyun-seong : Director of Banseok Hospital and Gu Jin-gi's only son. • Woo Hyun-joo as Pyo Eun-sil : An ace attorney and the team leader of Banseok Foundation's Legal Team. •
Choi Deok-moon as Lee Do-hyeong : Former Director of Anesthesia Department at Banseok Hospital, currently serving as Assistant Director of Banseok Hospital. • Kim Hyung-mook as Park Ki-tae : A thoracic surgeon at Banseok Hospital. •
Lee Seung-woo as Choi Yo-sub : A 3rd year fellow at the Thoracic Surgery Department of Banseok Hospital. • Lee Gyu-bok as Director Cheon : Gu Jin-gi's bodyguard and assistant. • Shin Su-jeong as Yoo Ga-yeon : Head of the management office at Banseok Hospital. •
Kim Ho-jung as Cho Jung-hyun : Gu Jin-gi's wife.
New Hope Attorney's Office •
Jung Min-ah as Jo Da-rom : Special Investigator at New Hope. • Seo Yoon-ah as Ban Soo-hee : Jo Da-rom's college senior and ace medical journalist. •
Jo Hyun-sik as Kang Dae-woong : A 4th term member of the National Assembly and the leader of the ruling Daehan Party. • Kim Tae-gyeom as Michael Young : Strategy Team Leader of Honors Hand Asia. • Park Joon-hyuk as Kwon Yun-seok : Yoon Mi-sun aide and legal assistance. •
Lee Kyung-jin as Jayden's mother : She is a kind woman and mother of Jayden.
Extended • Han Seung-bin as Geum Seok-ju : Geum Seok-young's younger brother who suffers from a heart disease. • Lim Cheol-hyung as Nam Hyuk-cheol : A
death row inmate who was once a reputed medical device businessman, Cho Jung-hyun's ex-husband. •
Kim Yoon-seo as Jung Yun-jeong : An elite autopsy surgeon from the National Forensic Service. •
Nam Gi-ae as Han Yi-han's mother • Hwang Hyun-bin as Mongolian housekeeper • Jang Seo-yeon as Gil Seo-yeon : An idol who lost her voice due to the side effects of a surgery. • Park Seon-hye as Gil Seo-yeon's mother • Park Min-sang as Nam Jun-hwan : The son of Nam Hyuk-cheol and Jo Jung-hyun. A patient with
hypertrophic cardiomyopathy. •
Jung Bo-min as Yang Seon-ae : Yoon Mi-sun's daughter. • Kim Dae-geon as Do Jin-woo : Yang Seon-ae's boyfriend. • Seo Jin-won as Ho Jun-bu == Production ==