Prankster: He enjoys teasing Detective Deok. However, at crucial moments, he shows a reliable side by looking after his teammates. Investigation Ability - Encyclopedia: Based on his vast knowledge, he explains case backgrounds, technical terms, and history. When an investigation hits a wall, he finds a breakthrough with his knowledge. Male. Partner: Detective Ttoni 24 years old Real name: Gong Hyung-jun

23 years old Male Team: Criminal Investigation Team 2 Ability: Sixth Sense. Can communicate with the five senses and even talk to spirits. Partner: Inspector Oh Real name: Deok-gae

Age: 32 Male Team: Investigation Team 2 Ability: Mechanic. Good at fixing machines and using computers. Has a lethargic streak. Partner: Detective Jun-yeop Real name: Gak-byeol

Age: 29 Female General Team Leader Ability: Case Reconstruction. Can investigate in detail by reconstructing the scene. She and Detective Ra are like neighborhood siblings (though she calls him Detective Ra at work). Real name: Jam-tteul

Age: 31 Male Team: Investigation Team 3 Ability: Psychological Insight. Can determine if someone is lying by analyzing their words one by one. Partner: Detective Shin Seung-ah Real name: Su-hyeon

Age: 35 Male Team: Violent Crimes Team 2 Partner: Detective Ra A doting father. Rough at work but cherishes Detective Ra. (Possesses great strength) Real name: Kwon Min-gu

Age: 34 Male Team: Criminal Investigation Team 2 Partner: Detective Deok Wears glasses and is calm yet bright. Takes good care of Deok-gae. Real name: Oh Jun-hyeon

Male 20 years old Team: Investigation Team 2 Partner: Inspector Gak Good with computers, acts as Inspector Gak's navigator. Real name: Kim Jun-yeop

20 years old Gender: Female Team: Investigation Team 1 Partner: Detective Gong In a mentor-mentee relationship with Detective Gong, whom she calls 'Detective Gong-nim'. Real name: Ttoni

Age: 20 Female Team: Investigation Team 3 Partner: Inspector Su Calm and modest. Gentle and has some knowledge of psychology. Real name: Shin Seung-ah