Hatch S01E20 - A Little Girl's Story

Saheonbu threatens to resign all its members unless right to investigate the murder case involving Prince Yeoning is given to them. The king calls Prince Yeoning and asks him to tell him everything that he knows about the recent incidents. When he does, the king is deeply moved and decides to give Prince Yeoning three days to prove himself innocent. The investigation of the murders lead to human trafficking deals with Qing and to the courtesan house.