Do Ha-na saves Mun from the attacks of a powerful demon with a malicious tongue. Kim Jeong-yeong helps Mo-tak look into his last detective case.

While the Counters attempt to keep the truth behind his painful past from Mun, he discovers a mysterious memory card among his parents' belongings.

During a trip into his most traumatic memory, Mun has his first encounter with Ji Cheong-sin. Later, he leads the Counters to a car junkyard.

Things get personal for Ha-na as she takes down a familiar demon. The team tries to locate a reservoir tied to a case Mun's father had worked.