Gil Soo Hyun is extremely intelligent. At the age of 10, Gil Soo Hyun attended Harvard University. After graduating there, he decided to work at the FBI and worked there for 10 years. Afterwards, he decided to come back to South Korea. He now works as the leader of the Special Missing Persons Unit. Genius ex-FBI agent Gil Soo Hyun and veteran detective Oh Dae Young partner up in a missing persons task force to solve the toughest cases.