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When class 2-3 arrives at a retreat center, the rest of the classes are nowhere to be found. Their homeroom teacher goes out to look for the missing classes, and they are left alone in the building. Meanwhile, Yoon-seo and all of her classmates get a message out of the blue. With the rules of the game, each one of them receives a role, and the game begins.
Lee Jae-in
Lee Yoon-seo
Kim Woo-seok
Kim Jun-hee
Choi Ye-bin
Oh Jung-won
Cha Woo-min
Ko Kyung-jun
Ahn Ji-ho
Jin Da-bum
Jeong So-ri
Kim So-mi
Kang Seol
Choi Mi-na
Oh Jung-taek
Cha Yu-jun
Song Byeong-geun
Im Eun-chan
Kim So-hee
Baek Eun-ha
Bae Jae-young
Kim Jin-ha
Chun Young-min
Park Ji-soo
Suh Dong-hyun
Park Woo-ram
Do Byeong-hun
Kim Dong-hyun
Hong Min-gi
Jang Hyun-ho
Park Ju-won
Ahn Na-hee
Park Yoon-ho
Heo Yul
Kim Gyu-bin
Lee Joo-young
Hong Seong-pyo
Nam Yeon-woo
Park Sang-eun
Shin Seung-bin
Kim Min-seo
Choi Ju-won