Jae Sang keeps thinking that Si On is cheating on him with Dong Taek. He decides to tail Si On and Dong Taek. He finally arrives at the place where the two has entered, and he is surprised. Meanwhile, Pil Woo’s experiment fails again, and that makes Do Sik furious. He heads to Pil Woo’s lab and makes a threat to Pil Woo.
시온은 세경보육원 사건의 배후로 의심되는 장도식을 조사하던 중 윤필우와의 밀회를 목격한다.
재상은 보나의 어린이집 친구가 실종된 사건을 수사하지만 엇갈리는 증언에 갈피를 잡지 못하는데..
