International star Rain makes his acting comeback in Korea through this drama as Ji Woo, a manipulative, charming, and witty playboy who is also the top private investigator in all of Asia. He is also wanted for murder, and is constantly on the run from Detective Do Soo (Lee Jung Jin). As Ji Woo tries to solve his best friend's murder and figure out who framed him, the mysterious Jin Yi approaches him with a new case. However, she has other intentions, as her parents' deaths are inextricably linked to Ji Woo. Her fiance Kai (played by X-Men: Wolverine's Daniel Henney) supports her from a distance as she plunges into a deep underworld to find her parents' killer. In addition, the reappearance of a vast amount of gold lost during the Korean War sets in motion the search for truth and revenge. This action-packed comedy features many international locales - from Japan to the Philippines, Thailand to China - and a high-profile cast like no other.