Choi Kang Ta

He's a strikingly handsome man and resourceful person with many skills. He was orphaned when he was 7 years old when his parents and sister were killed. An American couple adopted him and he grew up in America. When he becomes an adult, he partners with Vivian on secret missions with great success. Due to his tactical brilliance, he is promoted to the leader of his spy team. He returns to Korea whereupon he learns about the wrongful death of his father and decides to get to the bottom of it. But he meets a charming journalist named Bo Bae by coincidence and falls in love with her. He also learns that Bo-bae's father was behind his father's death.