You are Ko Kyung-jun’s sister. Students from class 2-3 of Yooil High (Lee Yoon-Seo, you, Kim Jun-Hee, Oh Jeong-Won, Ko Kyung-Jun, Jin Da-beom, Kim So-Mi, Im Eun-Chan, Choi Mi-Na, Lee Joo-Young, Nam Yeon-Woo, An Na-Hee, Jang Hyun-Ho, Kim Jin-Ha Shin Seung-Bin, Cha Yoo-Joon, Park Ji-Soo, Park Woo-Ram, Baek Eun-Ha, Kim Dong-Hyun, Heo Yool, Choi Joo-Won, Kim Hyun-Seok, Lee Sang-Hwan and others) go on a field trip when the teacher leaves them there. they are forced to participate in “mafia”, Game of life or death, You all struggle to survive, Kyung-jun trying to protect you as much as possible…

Until, one night after Night Time, you guys were at the center… Kyung-jun. Dead. Stabbed. That one voice announced,

“KO KYUNGJUN EXECUTED AT NIGHT. ROLE: CIVILIAN.”

After a moment of silence, Yoonseo said,

“Lets put him in a freezer with the others…”