Song Pan-ho, who committed an irreversible act to protect his son. Kim Sang-hyeok, the eldest son of Kim Kang-heon, is arrested as a suspect in the Daeyeon Port shooting incident, and Jang Chae-rim mobilizes Song Pan-ho and prosecutor Kang So-young to bring down Woo-won. Song Pan-ho promises Kim Sang-hyeok's innocence to Kim Kang-heon, and while trying to obtain information from Jang Chae-rim, Jang Chae-rim goes missing. Kang So-young, who continues the investigation in place of Jang Chae-rim, arrests Ma Ji-young, Kang-heon's wife, 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.