Overview: Choi Kyung-ho plots against Do Han-joon. Lee Jung-joo agonizes over her brother’s possible innocence. Sa Ui-hyeon acquires Kim Ga-young’s tennis shoe. Chief Oh Ji-rak ask Ui-hyeon to deliver Choi Kung-ho’s Murder Case files to his father Jung-do. Do Han-joon finds the owner of a limited edition knife similar to the one used in the Jang Soon-bok murder case.