Min-hyung, a millennial detective, finds a name on a victim's suicide note. The letter puts Jung-woo in a tight spot.

Acid splashing occurs. In front of patients whose faces and spirits are already destroyed, Jung-woo remains cold. What makes him cold-faced?

Jung-woo finds the patient just before he jumps off the roof. Meanwhile, Min-hyung continues to chase the suspicious figure around Jung-woo.