Supported by the NFS, the first responders confront the sinister mastermind in a decisive showdown.

Ho-gae vanishes after a caravan explosion. Amidst the chaos, a showdown is drawing near.

Ho-gae delves into the investigation of Ma Joong-do's murder and reopens a past murder case and prison escape.

The police and fire department respond to an urgent call about a horrifying incident regarding organ extractions.

Criminals plan to endanger the NFS building. Can the team safeguard the place?

An unidentified body is found after a brawl at a junkyard. A crisis arises during the autopsy.

Do-ha concludes that the death at the villa was an accident, but Ho-gae continues his investigation. Do-ha uncovers the dark side of the neighbours.

When a murder occurs at Myeong-pil's villa, Ho-gae leaves his post and joins the case. Kang Do-ha joins the National Forensic Service.

The arsonist's final plan gets revealed. Can Ho-gae save everyone from danger and catch the criminal?

The first responders and the NFS cooperate to uncover clues to the serial arsonist.

Two fires break out in different locations. The first responders find themselves in a crisis.

A bound corpse emerges following a serial arson. The first responders to unite in the investigation.