Episode Summary
The investigation team analyzes Yu Fan's relationships and lack of presence. They participate in a LARP to gain insight, experiencing scares and discovering clues pointing to premeditated murder. Xu Tongsheng conducts an experiment confirming the explosive nature of the setup. Gao Yarui reveals her conflicts with everyone after realizing she was the intended target.
Spoiler Alert
Shen Ye calls a meeting to analyze Yu Fan's relationships. According to several classmates, Yu Fan was almost invisible in the class, a real wallflower. Her relationships with her roommates were also unremarkable. Before Gao Yarui transferred in, Yu Fan was relatively close to Jin Yan. Afterward, she became closer to Gao Yarui. Two girls who bullied Yu Fan revealed that Gao Yarui, finding daily studies boring, instigated the teasing of Yu Fan, only to then step in as her "savior." Because their families' businesses relied on Gao Yarui's family, they had to cooperate. This pattern suggests Gao Yarui frequently bullied classmates, but soon after, she'd turn the bullied into friends.
After the analysis, Jiang Li points out that they have too little evidence to deduce everyone's motives. He suggests they try a live-action role-playing game (LARP) to get a better feel for the situation. Shen Ye immediately agrees, but because they are still in a cold war, he doesn't directly invite Xu Tongsheng. Xu Tongsheng ends up signing up on his own.
Zhen Qiang takes them to a new LARP location, distributes the scripts, and explains the rules. During the first step, where players hold hands and spin, both Xu Tongsheng and Shen Ye are reluctant to reach out first. Jin Chun mediates, and the two finally hook fingers, prompting Jin Chun to tease them for being overly dramatic.
The first round yields no discoveries. After the second round begins, both Xu Tongsheng and Shen Ye feel like they've entered the wrong rooms. The voltage becomes unstable, and Shen Ye, frightened, calls out for Xu Tongsheng to save her. Xu Tongsheng first comforts Shen Ye and then searches for an exit. Moments later, the voltage returns, and Shen Ye tells Xu Tongsheng it was a false alarm.
In the final round, Xu Tongsheng and Shen Ye switch rooms. Other than that, there aren't many discoveries. They analyze the scene together and find a photo of a girl in the "Sorrow" room, alluding to the "missing classmate." Behind the photo is a mirror; if touched accidentally, one would see their own reflection. The deceased entered the wrong room in the fourth round, indicating the entire scene was a premeditated murder.
Shen Ye questions everyone again, one by one. Fang Ni states that she was closest to Cheng Sisi, and her relationships with the others were just ordinary roommates. As for Gao Yarui and Yu Fan, they were good friends in public, but back in the dorm, Gao Yarui would bully Yu Fan. If Yu Fan hadn't entered the wrong room that day, Gao Yarui would have been the one burned to death.
Everyone consistently states that the props for the LARP, the strong liquor and the glass bottles holding the candles, were given to them by Gao Yarui. The relationship between Gao Yarui and Yu Fan is indescribable. Finally, when they are about to question Gao Yarui, Xu Tongsheng tells Shen Ye to hold off, as he needs to return to the Fire Investigation Department to conduct an experiment.
Xu Tongsheng places a nearly burned-out candle on a glass bottle filled with alcohol. The candle burns down and falls into the bottle, immediately igniting and causing an explosion. Shen Ye continues to question Gao Yarui. When she learns that the script was originally targeting her, Gao Yarui reveals her conflicts with everyone.
