Ja Eun, Soo Ji, and Jae Hyeong shoot at themselves, acknowledging their own flaws. Then, they turn to each other and playfully highlight the good traits of each other, shooting at one another. Meanwhile, Harim is furious and recalls a childhood scene where she was shot with toy guns by her classmates. Eun Byeol notices and signals Da Yeon to stop the girls from having fun. Da Yeon approaches and aggressively yells at them, but Eun Jeong intervenes. Da Yeon becomes enraged and hits Eun Jeong, who is pushed and falls onto a wooden board. Everyone rushes to help her and sees her leg bleeding out because a nail on the board has stabbed Eun Jeong's leg. Eun Jeong is then brought to the hospital. Mr. Lim, angry, calls the principal to inform her about the incident. She asks him to resolve the issue and ensure that Eun Jeong's family won't make a big deal out of it. She then sets a meeting with Harim's mom, Do Ah's dad, and Da Yeon's dad. Harim's mom tells her to keep the incident a secret. Meanwhile, Da Yeon freaks out and meets with Do Ah and Seol Ha. Da Yeon blames Eun Byeol for telling her to intervene and get into trouble and hopes Harim can help her get away with this. However, Seol Ha gives her a reality check. Da Yeon is pissed and insults Seol Ha, telling her that they are not at the same level because Seol Ha's dad is just her dad's driver. Seol Ha gets offended and walks away. Meanwhile, Ja Eun has a flashback of her and Harim when they were kids, seeming like Ja Eun was a bystander when Harim got bullied. Ji Ae is bullied in her group and moves to stay at Soo Ji's team place and is welcomed by everyone. At night, no one can sleep because they are all very worried for Eun Jeong and want to know if she is okay. Suddenly, someone rings the bell. Mr. Lim calls all the girls out and informs them that Eun Jeong has been transferred to Seoul for the surgery. He also warns them not to disclose the incident, stating that what happened to Eun Jeong was just an accident, and assigns Da Yeon two months of corridor cleaning as punishment. Soo Ji tells him they should call the school violence committee instead of giving cleaning duties, but Mr. Lim dismisses her. At that moment, Yerim receives a message from Eun Jeong's coach, telling that Eun Jeong can no longer swim due to her injury. Da Yeon, drunk, informs Mr. Lim she'll send her housekeeper to serve her punishment. This infuriates Yerim, who grabs Da Yeon's head and tries to attack her. Soo Ji recalls all the horrible things Da Yeon has done and then stops Yerim, asking to make Da Yeon pay herself. Harim then texts the group chat, stating she has already decided on a punishment for Da Yeon. After the trip, Do Ah visits Eun Jeong at the hospital but avoids Ja Eun and Ye Rim upon seeing them arrive. The next day at school, Soo Ji tries to recruit more girls to her team and leaves them a note under the table but she only receive two responses. she also spreads the news about Eun Jeong and Da Yeon on a chatroom app for students. Do Ah shows her dad that the news has already spread everywhere on this chatroom app and it will quickly reach the press and other social media platforms. Meanwhile, Mr. Baek tells Harim that he will send her to study abroad because he can't stand her anymore, even if she uses the proof of his money laundering to blackmail him. Harim tells him that her grandmother likes her more than anyone else and won't let this happen. At school, Mr. Lim enters the class and tells Da Yeon to come with him to the office, informing her that she will be transferred. And if Da Yeon's family give him enough money, he will tell her new school that she was actually the victim. However, Da Yeon's dad arrives and jumps in to beat her up ferociously. Soo Ji goes to the convenience store, and Seung Hwa gives her the usernames and passwords for anonymous accounts on the chatroom application. It turns out Soo Ji and the girls use these accounts to spread the news and then delete them before they can be tracked down. Then, Seung Hwa will create a new set of accounts for them. That's the only way they can avoid Harim's influence. Meanwhile, Harim goes to her mom's office and screams at her for letting Da Yeon go. Harim's grandmother arrives, scolds Yi Hwa, then turns to Harim and praises her for acting as a leader. That night, Harim waits outside Ja Eun's house again and cuts off her hair. She also sends Ja Eun an article framing Soo Ji's dad for corruption. Ja Eun receives a call from her mom; Harim had told her mom about her secret, and she asks why Ja Eun would do something like that, causing Ja Eun to break down into tears. The next day, Soo Ji notices Ja Eun isolating herself and checks on her, but Ja Eun tells Soo Ji to mind her own business. Soo Ji is surprised by Ja Eun's sudden attitude change, but then Harim arrives, shocking the class with her new haircut. Soo Ji sees some hair on Ja Eun's shoes and realizes something is up between them. However, due to the final exam that day, Soo Ji can't investigate further. At night, she goes to see Seung Hwa and tells him about Ja Eun. He then shows her a few recordings from an app he secretly installed on Ja Eun's phone. Soo Ji is angry that he spied on Ja Eun's phone, but he shows her a few recordings to prove that Soo Ji can trust Ja Eun. They then find the article Harim used to threaten to ruin Soo Ji's dad's career and understand why ja eun has been acting weird. At home, Soo Ji reads the article about her dad and overhears him screaming at someone on the phone, suspecting that the call is related to the allegations in the article. The next day, Ja Eun continues to avoid Soo Ji because Harim threatened to label Soo Ji a bully and tarnish her reputation. Soo Ji's group meets again on the roof without Ja Eun. Soo Ji shows understanding and tells her friends that Ja Eun needs time. She asks her friends to recruit more girls to their side to win the vote to end the game. Soo Ji even volunteers to take the rank F, if their plan fails. Eventually, they convince more girls to join. Soo Ji explains to the new girls that what appeared to be just a game is actually a bullying scheme orchestrated by Harim. With 13 girls, they now have a majority against her. Meanwhile, Woori learns Yerim will perform at the school festival and decides to attend the next day. Soo Ji meets Seung Hwa, who gives her another secret camera to install in the classroom. The next day, the school celebrates its annual festival after the final exams, on the last Thursday of the year. Yerim performs with her group, and Seung Hwa attends, disguised with a cap. After her performance, Yerim leaves the stage in tears, followed by someone in a teddy bear costume. Meanwhile, Soo Ji goes to meet someone. The school bell rings, signaling the time of the month for class 5 to return to their class for the vote.

Suddenly, Do Ah bursts in to join the vote, telling everyone she is still one of the class members. Meanwhile, Yerim is rushed to the hospital on a gurney, leaving Soo Ji in shock. Furious, Soo Ji returns to the class and confronts Harim, grabbing her by the neck, convinced she is responsible for Yerim's condition