After the death of an unknown uncle, a woman inherits a burial ground and finds herself in the center of a string of murders and dark secrets.

A death on live TV. A culprit who turns to gas. Behind it, a secret project that used and discarded the vulnerable. One detective pursues the dark truth.

Hellbound takes place in 2022–27 in South Korea. An otherworldly face called an angel suddenly starts to materialize to deliver prophecies called decrees that condemn certain individuals to Hell at a specific future time, either seconds or years away. Three monstrous supernatural beings called demons appear at almost the exact time to maul and incinerate the person's body in a spectacular show of force called a demonstration. Two organizations in cahoots, the cult-like New Truth Society and the gang-like Arrowhead group, gain power by playing on people's fears.

Professor Se-jeong is thrust into a bloody nightmare when a rapidly mutating virus is released during a biotech conference causing authorities to seal the facility. Trapped inside with no escape, Se-jeong along with a small group of survivors must fight to stay alive while the infected undergo horrific transformations.