After hours of interrogation, Wei, barely alive, enters a nightmarish version of the school that is seemingly abandoned with most of the rooms boarded up with placards of mourning.

Finding the book club at a bomb shelter on school grounds, the other members and Miss Yin turn on Ray and accuse her of being the rat.

She subsequently found comfort in and entered a romantic relationship with Mr. Chang, who was also deeply involved with the book club.

Inspired by how her mother framed her abusive and philandering father and got him arrested; Ray planned to get rid of Miss Yin.

In the auditorium, Wei sees the other book club members have been strung up and executed; and is captured by the school's military inspector Bai.

Ray then recalls that she killed herself out of guilt after the book club's arrest; and that she has been trapped in a hellish, cyclic purgatory, repressing her memories and refusing to acknowledge her wrongdoings.

Fang Ray Shin's student ID in the game is "5350126," but in the film, it has been changed to "493856," symbolizing the commemoration of martial law in Taiwan in 1949, lasting for 38 years and 56 days.

Wei Chung-ting's student ID "501014" commemorates the death anniversary of Zhōng Hàodōng, the former principal of National Keelung Senior High School.

As a member of the Chinese Communist Party, Zhōng Hàodōng organized the Guangming Daily (Guāngmíng Rìbào) and advocated overthrowing the regime that caused the 228 Incident.

[8] The story and game are inspired by true events, specifically the 1947 Keelung Senior High School incident [zh].

The site's critics consensus reads, "Politically charged horror that's as viscerally effective as it is intellectually stimulating, Detention's got class.

Compared to the video game, Han Cheung opined that the film felt "simplified" and that it overemphasized its White Terror setting without focusing on the political background of the period.

[14] A review in Variety described the film as generally absorbing and entertaining, but noted problems with the narrative, pointing to 'a whiff of sexism in the treatment of naive, jealous schoolgirl Fang, while the underlying ickiness of the teacher-student love affair goes largely unmentioned'.