After losing her husband to serial killer Lee Soo Yeon, police detective Lee Hwa Sun makes her way to Muji city in order to bring the murderer in. But unlike what she is hoping to find, she runs into an enormous sinkhole in the middle of the mountains. Black smoke arises from this mysterious sinkhole and the people of Muji are left clueless about what it is.
Kim Ok-vin
Lee Hwa Sun
Lee Jun-hyuk
Yoo Tae Han
Yoon Jung-hoon
Woo Sang
Park Keun-rok
Choi Seung Tae
Jang Sung-won
Lee Young Tae
Lee Ha-eun
Yoon Saet Byeol
Kim Byeong-gi
Choi Gyeong-su
Oh Yu-jin
Han Dong Rim
Song Sang-eun
Song Sang Eun Kim Seon Nyeo / "Sunnyeo" / "Madame Kim"
Lee Ye-bit
Jung Do Yoon
Bae Jung-hwa
Han Ji Soo
Im Won-hee
Park Soon Il
Zo Zee-an
Cho Hyun Ho
Kim Do-hoon
Lee Jin Seok
Kim Su-ol
Yoon Ji Ae
Heo Hyung-kyu
Kang Sung Beom
Jang Myung-kap
Son Dong Goo
