The drama tells the story of Baek Bum, a perfectionist and picky forensic scientist, and Eun-sol, a prosecutor with a super-strong image memory, who jointly investigate a case. Jung Jae-young will play the role of Baek Bum, a forensic doctor who has worked at the National Institute of Scientific Investigation for 10 years. Although he is recognized as a talented person, he is a genius and a weirdo with a cold personality and is obsessed with the invisible truth. Jung Yoo-mi will play Eun-sol, a prosecutor at the Seoul Eastern District Prosecutors' Office in the drama. She is a person with a unique experience and unique feelings born with a "gold spoon", and she is a prosecutor who finds out the truth through "sincerity". Lee Yi-kyung plays the role of Kang Dong-yoon, a passionate detective and playboy.