At a deserted cabin where no one comes around, a man carries in a young woman. He looks at the woman who is unconscious. He starts sobbing as he undresses her layer by layer. Then he has intercourse with her. What made thier relationship so tragic that he had to bring her up all they way to this lonely cabin to do this to her? And the shocking ending is...

The story takes place in Seoul, 2011. Lee Yoon-sung is a talented MIT-graduate who's working on the international communications team at the Blue House. He encounters dangerous situations while solving a variety of cases, both big and small, for people who need his help, and eventually becomes a "city hunter."