Prior to the series' timeline, Ji-woo, a young, rich and cunning Korean private investigator handled the case of an Asian couple who died at a casino in Las Vegas. He solved the case in a single day, concluding that it was a suicide. As a result, Ji-woo received a large amount of money as the reward from the casino's owner General Wei and became renowned for being the first private investigator in the world to solve a case in a single day.
Shortly after the case was concluded, his Korean-American best friend Kevin was murdered. The Korean police acquired some mysterious evidence framing Ji-Woo for his friend's death. The Korean police issued a warrant to arrest Ji-woo and Squad Leader Officer Do-Soo was appointed for this case.
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