Ga Hyeon struggles to decide whether to help Se Rin or to ignore her for her deceitful wrong doings. Even before she had time to make a decision, Se Rin is found dead. Hyeong Ju and Ga Hyeon sort out Young Woong and Jung Tae as key suspects, but it turns out that their alibis are legitimate. Meanwhile, Jung Tae makes another deal with Lee Shin.

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. While Ga Hyeon being confused by a series of puzzling events, Jung Tae faces a death threat by an unexpected acquaintance.

While Hyeong Ju is acting suspiciously for some reason, a voice recording is delivered to Seoul Makang Police Station as well as to Mr. Hwang and Ga Hyeon. This triggers Ga Hyeon to investigate the voice recording, and she eventually concludes that Hyeong Ju could actually be the culprit. However, her speculation is proven wrong when she faces a threat from the real culprit.