Detective Kang Jun-hyuk, who is timid and extremely introverted. Jun-hyuk, whose heart beats whenever he encounters a dangerous situation, lives as if he is enduring every day in a drug investigation unit that does not match his personality at all. And then, one day. During the investigation, a steel bar that flew in penetrates Junhyuk's head and is declared brain dead.
However, after secretly undergoing a 'partial brain transplant', it comes back alive like a miracle. Junhyuk, who woke up, was 180 degrees different from before. Fear disappears due to damage to the amygdala, and at the moment of crisis, the implanted brain is activated... The drama "Superhuman Detective" is a city of joy where a drug giant has ruled over the law,
It is a "Stylish Emotional Action Noir" in which a dark hero equipped with a monster's brain fights against the evil (惡) inside and outside of him.