Is being alluring an advantage for a spy girl? Pretty and talented, North Korean agent Rim Gae-soon (Kim Jung-hwa) has infiltrated into South Korea for a secret task. Could she gain any privilege on her beauty to complete the mission? Martial arts veteran Rim Gae-soon sneaks into South Korea to dig out Kim Yeung-guan who stole money for spy maneuvers. She intends to cover herself with a fake identity «Hyo Jin» and works in a fast food restaurant. However underhand she does everything, she mesmerizes people around her and every day thousands of guys are flocking to the restaurant just to meet her. One of the guys, Jae Go Bong (Gong Yoo), failed twice to get a place in the university due to his serious constipation and overdose of traditional Chinese medicines. He swoons over Hyo Jin as the others do, but he is called for military service. Discovering Hyo Jin loves chasing men in sunglasses, Jae Go Bong is set to reveal his feeling to her. «Spy Girl» is the latest romantic comedy by novice director Park Han Joon, starring hot new K-idols Kim Jung-hwa and Gong Yoo.