Folge 13.

One wedding (is announced) and a funeral. Jang-yeol is unexpectedly sensitive to Ye-bun's suffering. Seon-woo's absence is marked as suspicious. Captain Jong-muk and his team are forbidden from investigating the serial killer case and are directed to "protecting people's livelihoods." As one suspect after another is eliminated, Jang-yeol goes back to the beginning and questions all of his conclusions. Ye-bun bursts into his home with a theory that connects all new dots in a terrifying way.