Choi Kang is a drifting, aimless young man with no job, no connections, and little ambition. After being expelled from high school for fighting, he spends his days lounging at home, gaining nothing but the admiration of local gangs for his brawling skills. His younger brother, Choi Sun, holds a prestigious position at LK Corp., constantly reminding Kang of his own perceived failures. But everything changes when Kang saves an elderly woman from being hit by the president's car outside Gyeongbokgung Palace. In a shocking twist, Kang turns down the president’s generous reward and instead, is offered a job with the secretive Korean Secret Agency (KSA), thrusting him into a high-stakes world of espionage and danger. At the KSA, Kang’s life takes an exhilarating turn. Though he lacks formal credentials, his street smarts and raw physical talent make him an unlikely yet effective agent. As he takes on thrilling missions and faces unforeseen challenges, Kang's world expands in ways he never imagined. He just might find more than just a career, perhaps even love and the respect he’s always craved.