Ji Wung and Yong Min prepare to take exams to become a police officer. They become upset with someone with the online username of Re Na, because of her vicious comment left on an online article about a soldier's death. They then search out her real identity and discover her real name and address. Ji Wung and Yong Min go to her apartment to receive an apology all the while streaming their surprise visit online. When they arrive at her home, they find out that she had hanged herself. What apparently looks like suicide is held under suspicion by Ji Wung and Yong Min as foul play. After posing the possibility of homicide, the Ji Wung and Yong Min return to the crime scene to try to uncover the truth.