Seong-jun and Eun-ae discover an astonishing fact after repairing the walkie-talkie. Meanwhile, Gyeol recalls a crucial clue about the real culprit after talking to Gwon-sik and falls into even deeper agony. Seung-ri receives a call from an unexpected person to talk about the truth, and Min-ho also verifies Gwon-sik's whereabouts 25 years ago, bringing long-hidden secrets to light.
