After a mysterious death, the king summons the spirit slayer Gu-cheon to banish the pond spirit. Saeng-gang, who hears the dead, also appears before him.

The king orders Gu-cheon to save the prince — or die. Forced to enter the spirit realm, he comes face-to-face with the ghost of a former royal guard.

Gu-cheon and Saeng-gang attempt to seal the pond spirit for good. Still suspicious about the crown princes' deaths, Gu-cheon returns to Saeng-gang.

Gu-cheon escapes danger with Saeng-gang's help. As the king falls ill, Gu-cheon fights the evil spirit — only for a guardian spirit to stand in his way.

During Gu-cheon's fight, Saeng-gang comes under threat — bringing them closer to the truth. But Gu-cheon loses his sight, putting their mission at risk.

The king and queen dowager clash over the tragedies as resentful spirits close in. Gu-cheon and Saeng-gang steel themselves for a final confrontation.

Chaos engulfs the palace as the vengeful spirit moves to devour everything in its path. Can Gu-cheon and Saeng-gang stop him before it's too late?