A Ghost Saw The Killer!

During a flashback while Ms. Ma is being interrogated by Tae Gyu and Prosecutor Yang, she claims that although she had wanted to keep her daughter by her side, she did not kill her. In addition, she claims that a long-haired woman in a white hanbok has told her that she saw the killer. However, the police think that the long-haired woman is just a ghost and do not believe her.