An incident unfolds when a film crew goes to a reservoir to update the road view where an unidentified figure was filmed, and they encounter something in the dark, deep waters.
| Actor | Role |
|---|---|
 Kim Hye-yoonHan Su-in | Han Su-in |
 Lee Jong-wonYoon Ki-tae | Yoon Ki-tae |
 Kim Jun-hanWoo Gyo-sik | Woo Gyo-sik |
 Kim Young-sungSong Gyeong-tae | Song Gyeong-tae |
 Oh Dong-minSong Gyeong-jun | Song Gyeong-jun |
 Yoon Jae-chanJang Seong-bin | Jang Seong-bin |
 Jang Da-ahMoon Se-jeong | Moon Se-jeong |
 Jeon So-hyunOld Woman | Old Woman |
 Sul Youn-jiKim Soo-jung | Kim Soo-jung |
 Lee Sung-wookLee Jong-hwan | Lee Jong-hwan |
 Nam Min-wooCamping Couple | Camping Couple |
 Yoon Ye-jooCamping Couple | Camping Couple |
 Kim Tae-junTeam leader | Team leader |
 Kim Kye-hyungTeam leader | Team leader |
| HHeo Jun-hoTeam leader | Team leader |
 Limm Yea-eunTeam leader | Team leader |
| CCho Sung-hwanTeam leader | Team leader |
 Choi Hee-doPolice | Police |
| LLee Tae-yongPolice | Police |
 Choi Seo-yoonGhost | Ghost |
| EEom Yun-ahGhost | Ghost |