- Set in Incheon, South Korea, detectives try to catch criminals, who hide ugly truths.
Kang Do-Chang (Son Hyun-Joo) has worked as a detective for the past 18 years. He was born and raised in Incheon. He investigates cases using his experience and personal connections, forgoing scientific technique or reasoning power.
Oh Ji-Hyeok (Jang Seung-Jo) is an elite detective. He has 9 years of experience. Unlike Kang Do-Chang, he investigates cases using evidence and insight into the criminal's psyche. Due to trauma from his childhood, he does not share his feelings. He is wealthy thanks to his late uncle, who left him with a large inheritance.
Jin Seo-Kyung (Lee Elijah) works as a newspaper reporter. She is a 5 year veteran and passionate about her work.
Jo Nam Kook
Son Hyun joo
Jang Seung jo
Oh Jung se