In the prestigious Shinha High School, there is a secret hidden between the third and fourth periods. There are 3.5 classes where time goes 10 times slower and 10 minutes becomes 100 minutes! Baek Ah-jin accidentally enters the 3.5th period and meets Kang Da-won, a male student who was trapped there. To escape Dawon from the 3.5th period, Ahjin solves the mystery hidden there. But there are people in the school who try to hide 3.5 classes...
Ryu Hee-jung
Director, Writer
Na Soo-jung
Writer
Jo Hye-won
Baek Ah-jin
Lim Ji-sub
Kang Da-won
Kim Woojin
Lee Hanik
Song Young-gyu
Han Je Moon
Kang Byul
Choi Seon Joo
Kwon Go-eun
Im So Ra
Lee Pu-reum
Lee Da Hee
Park si yun
Park Jeong Bae
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