S1, E4: Cha Don starts his first day as a probational prosecutor, and he is eager to win Se Kwang's acknowledgement to become a prosecutor. A case around Hwanghae Bank breaks out, and Cha Don plans to impress Se Kwang. He decides to come up with a plan to get Jae In, a Hwanghae Bank employee, on the prosecution's side. But things don't go as he planned. Ki Soon is desperately looking for her son, but she is not in the right state of mind after years in the psychiatric ward.