A huge explosion occurred at Lee Sang-taek's house... Lee Sang-taek's mother, Kim Mi-young, and youngest daughter, Lee Cheong-ha, who were inside, died. Kim Kang-heon suspects Sang-hyuk, who does not know where to go, and Sang-hyuk, attempts to smuggle himself through the dock gang. Meanwhile, Pan-ho is threatened by an unknown person who says he knows the truth about that day.

Song Pan-ho has done irreversible things to protect his son. When Kim Kang-heon's eldest son, Kim Sang-hyuk, is arrested as a suspect in the Daeyeon Port shooting, Jang Chae-rim mobilizes Song Pan-ho and prosecutor Kang So-young to bring Woowon down. Song Pan-ho promises Kim Kang-heon that Kim Sang-hyuk is innocent, and while he tries to get information from Jang Chae-rim, she goes missing. Kang So-young, who continues the investigation on Jang Chae-rim's behalf, captures Kang-heon's wife, Ma Ji-young, who was involved in the Lee Sang-taek family death case, and Kim Kang-heon orders Pan-ho to investigate Ma Ji-young without detention.