4 - 1New Emails Jun. 18, 2021
4 - 2The Face Of The Suspect Jun. 19, 2021
4 - 3The Phone Call From The Victim Jun. 25, 2021
4 - 4The Body In The Cauldron Jun. 26, 2021
4 - 5Running Away From Danger Jul. 02, 2021
4 - 6Circus Man's Multiple Personalities Jul. 03, 2021
4 - 728 Years Ago Jul. 09, 2021
4 - 8The Missing Teen Jul. 10, 2021
4 - 9Hidden Room Jul. 16, 2021
4 - 10Short Kidnapper Jul. 17, 2021
4 - 11Kwak Man Taek's Confession Jul. 23, 2021
4 - 12The Vimo Plant Jul. 24, 2021
4 - 13Episode 13 Jul. 30, 2021
4 - 14Episode 14 Jul. 31, 2021