She works as a social worker. She has a warm heart and is full of justice. She always puts people first and tries to be a reliable guardian to children who come from poor backgrounds. Together with detective Ryu, wants to find out the identity of the perpetrator of the series of murders. The killer killed her sweetest kid Yu-na. She keeps in touch with many jurors with whom she participated in a trial. She has a very good relationship with Juror 3, Jung In-seong, whom the killer, but she dk it.