Since she was a little girl, Sook-hee was brought up to become a deadly assassin. She gets a second chance in life when South Korea's Intelligence Agency's Chief Kwon recruits her to become a sleeper cell. "Work for us for 10 years, you'll gain freedom." Her new identity is Chae Yeon-soo, 27 years old, theater actress. With a promise of complete freedom after serving the country for 10 years, ...