Underground (2026)

Seung-hyeon, a construction chief battling PTSD, gets tasked with surveying Dohak Station—a site where a deadly accident shut down operations years earlier. As he and Joo-young venture into the unsettling, deserted tunnels, they run into two enigmatic laborers and soon find themselves disoriented, unable to find their way out. At the same time, a corporate executive and a shaman attempt a ceremonial rite to restart the project, only to provoke vengeful ghosts that unleash havoc, throwing all involved into a spiraling nightmare.