Fast-paced and fiery, this thrilling tale revolves around San (Lee Min-ho), who is a martial arts expert, and Yo (Wallace Chung), a master investigator and detective. They have been working as bodyguards-for-hire but with very little success, ever since their dismissal as Interpol officers a year back.
When a vague commission leads them to a hotel room in Incheon, South Korea, a terrorist bombing coincidentally takes place and turns the bumbling investigators into wanted suspects. Their informant dies at the scene, but the pair also immediately find themselves pursued by a rival group of bounty hunters.
Soon, they must go on the run and forced to team up with a motley trio – a bossy heiress Cat (Tiffany Tang), who is on an anti-terrorist mission since her lost childhood; tech guru Swan (Karena Ng), who is the resident hacker and maker of fantastic gadgets; and the muscled Babe (Louis Fan). To clear their names, they must work with the trio to track down the culprit of a series of bombings that have plagued an international hotel group.