The Mysterious Gentleman

The Mysterious Gentleman is the eighth episode of Season 1.

Summary
A mysterious old man invites the detectives individually to solve a fictitious 20-year old case. The first detective to solve the case would obtain a huge amount of money. The mysterious old man also promised to give the passcode for the box they obtained in Treasure Island. As they progress on the case, the fictitious case seems to becoming real.

Detectives

 * Yoo Jaesuk
 * Ahn Jaewook
 * Kim Jongmin
 * Lee Kwangsoo
 * Park Minyoung
 * Oh Sehun
 * Kim Sejeong