When dozens of people are injured in an unknown explosion in the middle of downtown Seoul, Detective Jae-hwan heads to the scene to find out what happened.

Reporter Kim Hyo-gyeong, thinking that the series of explosions is related to the Chimera, visits Jae-hwan, who was injured in the fall.

When Joo-seok dies, a special investigation team is set up to uncover the truth of the death. Jae-hwan begins to be investigated just for being at the scene of the incident.

Joong-yeop does not give in to the pressure of Yu-jin's interrogation and avoids answering.

Seoryun Medical Center's legal team halts police interrogation of Joong-yeop, the primary suspect, granting him freedom. Back at home, Joong-yeop reflects on his past at the Macheon Police Department.

Jae-hwan and Yu-jin look back at the situation regarding Lee Sang-woo's death, and find that there are also suspicious circumstances.