In a broken world where unresolved psychological trauma consumes people and twists them into grotesque monsters known as “Memorians,” society stands on the brink of total collapse.

One day, young Hae-on struggles desperately to save his own mother after she is consumed by her trauma and mutates into a Memorian. But before he can reach her, the elite rescue squad known as “Memory Divers” intervene, enforcing strict protocols that leave his mother trapped in a permanent, unresponsive coma.

Determined to uncover the truth, Hae-on discovers a devastating reality: the architect behind the Memorian outbreak, the man who destroyed his family and ruined the world, is none other than his long-lost father.

Refusing to surrender to despair, Hae-on enlists as a Memory Diver. Plunging headfirst into the perilous depths of the “Sea of Memories,” he embarks on a dangerous crusade to hunt down his father, reverse the devastation, and wake his mother from her endless slumber.