| 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." |
| Name | Character | Episodes |
|---|---|---|
| Lee Min-ho | Lee Yun Seong | 20 |
| Lee Kwang-soo | Ko Ki-joon | 20 |
| Lee Jun-hyuk | Kim Young Joo | 20 |
| Choi Jung-woo | Chun Jae-man | 20 |
| Min Young-won | Min Hee | 1 |