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.

Kim Hye-yoon
as Han Su-in

Lee Jong-won
as Yoon Ki-tae

Kim Jun-han
as Woo Gyo-sik

Kim Young-sung
as Song Gyeong-tae

Oh Dong-min
as Song Gyeong-jun

Yoon Jae-chan
as Jang Seong-bin

Jang Da-ah
as Moon Se-jeong

Jeon So-hyun
as Old Woman

Sul Youn-ji
as Kim Soo-jung

Lee Sung-wook
as Lee Jong-hwan