Moon Sang-beom (Son Jong-hak) and Oh Ji-hyeok (Jang Seung-jo) are in charge of their daughter, and they are like lightning...Gang Do-chang (Son Hyun-joo) and Oh Ji-hyuk (Jang Seung-jo), who heard the conversation in the black box of the car crashed by Woo Tae-ho (Jung Moon-seong), go to the director of TJ Group, Cheon Nana (Kim Hyo-jin), who was the passenger. On the spot, Chun Nana tells her two detectives her deep story with her husband and asks them to consider her husband's death as a simple car accident...