American name: David Lee.
Associate professor at John Jay College of Criminal Justice in New York.
Giving a lecture in criminal justice, Lee Hyeon has consulted to New York City Police. After returning to Seoul, he gets to consult to special crime investigation team.
The way he profiles people at a glance, analyzes crime scenes, and his spiteful tongue remind of Sherlock Holmes.
He doesn't bother what others think of him. Friends, girlfriend, relationship.. Those words don't seem to right to him. An attractive man, but solitary and snobbish. Also, he is a dangerous man.
When he was a child, his father, a criminal psychology professor, diagnosed him as a potential murderer. He got to know murderer Lee Junyeong and he lost his father and younger brother because of him. Then, his memory gets blurry after the accident.