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."

Yoo Jae-suk and Jo Se-ho who enter ordinary people's everyday lives, chat with them, and give them surprise quizzes! The talk and quiz show program will spotlight these people's lives and aims to gift them a refreshing, different kind of day. Recently they're also inviting celebrities & professionals to the show.