Hyeong Ju feels irritated that Ga Hyeon suspected him of the murder of Jung Tae. Meanwhile, Sun Ho asks Hyeong Ju to explain certain things he's been having a hard time understanding.
It was no surprise when Hyeong Ju finds out Jae Young was with Se Rin hours before she was murdered. Meanwhile, Jung Tae is threatened by Jae Young's father, a nominee for the Minister of Education, to stay low until the hearing is over.
As suggested by Lee Shin, Se Rin tries to flee from Seoul with Young Woong. However, Young Woong leaves Se Rin at the bus terminal to meet Hyeong Ju to file a suit against her.
While Hyeong Ju is acting suspiciously for some reason, a voice recording is delivered to the police station. This triggers Ga Hyeon to investigate the voice recording. She concludes that Hyeong Ju could actually be the culprit.
Sun Ho turns out to be the murderer who caused the deaths of resetters. However, Hyeong Ju does not have a clue about it and reports every detail of his investigation to him.
Attempting to stop Professor Hwang from making use of the reset for his personal enjoyment, Hyeong Ju dives into his second reset with the help of Lee Shin.
Luring Sun Ho into Hyeong Ju's trap was easy, and the police arrest him right after he fires a gun at Hyeong Ju. It seemed as if everything was over, but Hyeong Ju discovers a shocking secret.