In South Korea, the high school student and swimmer Jeong Tae-yeon (Yoon Seung-ah) is found dead in the pool, apparently a suicide.

Eun-su finds it difficult to earn respect in the classroom and is backed up by an older teacher, Mr. Cha (Kim Soo-ro).

The school's swim coach is murdered in the showers and the words "When an innocent mother is killed, what son would not avenge her death?"

The students try to save him by inputting the correct password phrase for the dryer with hints from various photographs, but are too late and Mr. Cha is incinerated.

Then, Eun-su announces that for 10 minutes from now, the students will be able to make a call from a phone that is locked in a safe, in the auditorium.

Se-hee was actually a member of Ji-yun's study group who was taken advantage of due to her unpopularity, and was also present at the night of Tae-yeon's death.

Upon learning the group's plans to assault Tae-yeon, she begs them to stop but is posed an ultimatum by Ji-yun: to either stay and stop them or leave them be, with her choice being to leave out of fear of losing her place in the study group, becoming a bystander to Tae-yeon's murder.

[1] While writing the script, it was suggested that the characters should solve their problems in a quiz show format like they did in the first film.

[9] The Hollywood Reporter wrote that the film was an "alarmingly brainless and sloppily directed follow-up to Death Bell" noting that the only "scene worthy of attention is when student Jang-kook is stranded on a corridor and repeatedly attacked by a motorbike outfitted with revolving blades.

[11] Despite negative reviews, both The Hollywood Reporter and JoongAng Daily praised the scene involving a metal-spiked motorcycle that attacks a student.

[1] Asian Economy credited Park Jiyeon, Eun-bin, Ji Chang-wook and Yoon Seung-ah as one of the factors for the movie's success praising their acting performance.