Composer
Director
Music Editor
Screenwriter
Main Role
- Seo Kang Joon Main Role
- Kim Ah Joong Main Role
- Kim Mu Yeol Main Role
- Lee Si Young"Ghost"Main Role
- Kim Sung Kyun Main Role
Support Role
- Jang So Yeon Support Role
- Song Sang Eun Support Role
- Heo Jun Seok Support Role
- Lee Kyu Hoe Support Role
- Kim Hyung Mook Support Role
- Choi Kwon[Special Investigation Bureau Agent]Support Role
- Ahn Sung Bong[Special Investigation Bureau Agent]Support Role
- Kim Min Song[Special Investigation Bureau Agent]Support Role
- Park Jun Hyuk[Special Investigation Bureau Agent]Support Role
- Gong Sang AhKim Min Seon [Sae Ha's mother]Support Role
Guest Role
- Choi Seung HoonKim Sae Ha [Young] (Ep. 1)Guest Role
- So A RinJung Sae Byeok [Young] (Ep. 1)Guest Role
- Hong Suk Bin[Stabbed cashier] (Ep. 1)Guest Role
- Kim Ja Young[Caregiver] (Ep. 1)Guest Role
- Byun Jung Hee[Noodle restaurant owner] (Ep. 1-3)Guest Role
- Bae Sung Il[Convenience store owner] (Ep. 1, 4)Guest Role
- Goo Jae Yeon[Neighborhood grandmother] (Ep. 1, 4)Guest Role
- Jo Hee Bong Guest Role
- Shim Wan Joon[Songje Police Station Detective] (Ep. 1-2, 4, 6)Guest Role
- Kim Young Sung[Songje Police Station Detective] (Ep. 1-2, 4, 6)Guest Role
- Kim Seong In[Songje Police Station Detective] (Ep. 1-2, 4, 6)Guest Role
- Ko Na Young[Factory worker] (Ep. 1, 7)Guest Role
- Jung Gi Sub[Former Admin Bureau director] (Ep. 1, 10)Guest Role
- Woo Soo Bin[Former Admin Bureau control room director] (Ep. 1, 10)Guest Role
- Won Chun Gyu[Hardware store worker] (Ep. 2)Guest Role
- Lee Jin Seung[ST Mulsan employee] (Ep. 2)Guest Role
- Yoon Soo Hyuk[Assemblyman Kim Han Seok's aide] (Ep. 2)Guest Role
- Joo Suk Je[NFS researcher] (Ep. 2, 9)Guest Role
- Kim Shi WooKim Sae Ha [Child] (Ep. 3, 5, 8)Guest Role
- Kim Song Il[Doctor] (Ep. 4)Guest Role
- Lee Yo SungKim Jin Young (Ep. 4)Guest Role
- Kimkwak Kyung Hee[Subway station janitor] (Ep. 4-6, 8)Guest Role
- Baek Seung ChulLee Jang Hyeok [Institute of Radio Research Janitor] (Ep. 4, 7-8)Guest Role
- Kim Ji HoonLee Shi Won [Jang Hyeok's son] (Ep. 4, 7-9)Guest Role
- Bae Eun Woo[Black cap woman] (Ep. 5)Guest Role
- Jung Won Joong[Minister of Commerce Industry and Energy] (Ep. 5-6)Guest Role
- Cha Sun WooJung Him Chan [Sae Byeok's brother] (Ep. 5, 9)Guest Role
- Kwon Hyuk[Admin Bureau control room chief] (Ep. 5-7, 10)Guest Role
- Moon Hak Jin[Subway station employee] (Ep. 6)Guest Role
- Myung In Ho[Subway station employee] (Ep. 6)Guest Role
- Lee Hae YoungKwon Soo Keun [Sae Ha's father] (Ep. 7)Guest Role
- Lim Seung Beom[Institute of Radio Research Employee] (Ep. 7)Guest Role
- Kim Deok Ju[Orphanage teacher] (Ep. 9)Guest Role
- Kim Sung Yong[Institute of Radio Research manager] (Ep. 9)Guest Role
- Jang Eui Don[Institute of Radio Research executive] (Ep. 9)Guest Role
- Kim Jong Ho[Institute of Radio Research executive] (Ep. 9)Guest Role
- Park Young Bok[Onlooker] (Ep. 10)Guest Role
- Na Ho Won[Onlooker] (Ep. 10)Guest Role
- Nam Dong Ha[Sae Ha's uncle] (Ep. 10)Guest Role
- Park Seung Tae[Grandmother] (Ep. 10)Guest Role
- Lee Ki Hong[Mystery man] (Ep. 10)Guest Role
- Yoo Jae Myung[Mystery man] (Ep. 10)Guest Role
- Yang Eun Sol[Person at subway station]Guest Role
- Seo Seung Won[Paramedics]Guest Role
- Byeon Gyeong Rok[Control room staff (past)] (Ep. 1)Guest Role
- Lee Chang Won Guest Role
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