About the series
A prequel to the series 'Black Sun.' The story of a dangerous deal connected to the biological weapon 'Möbius.' In 2006, the life of journalist Seo Su-yeong was tragically changed forever. On her birthday, she was hurrying to her sister, who was preparing a celebration for her. But upon arriving, she found only the girl's bloodied body. Seo Su-yeong knew who had done this out of revenge against her, through her sister. It was a certain Lee Gun-ho, about whom the reporter had compromising material. After the murder, he fled to China. Wanting revenge, Seo Su-yeong becomes an agent and goes to China to track down the criminal... In 2011, the cunning Lee Gun-ho still eludes her. This forces the young woman to turn for help to Jang Jung-woo, a disgraced black-ops agent who, due to a failed mission, cannot return to his homeland.