On the street-view screen of Salmokji Reservoir, where eerie rumors persist, an unidentified figure captured on camera appears, something that was never before recorded. With a strict deadline to complete the reshoot within the day, producer Su-in leads her filming crew to Salmokji. As filming begins, Kyo-shik, a senior colleague who had mysteriously disappeared after a previous visit to the reservoir, suddenly reappears as if nothing had happened. Soon, a series of inexplicable events unfolds, and the crew descends deeper into chaos. Amid the mounting terror, Ki-tae rushes over to help Su-in. But the more they desperately try to escape, the deeper Salmokji pulls them in... Once you enter there, you`ll never get out alive.