Already talented and famous KPOP stars are recombined to form the ultimate new girl group like puzzle pieces. Each competition is expected to bring fresh musical resonance and lively performances.
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...
Jo Hye-won (Korean: 조혜원), better known as Zoa (Korean: 조아), is a South Korean singer and rapper under IST Entertainment. She is the maknae of the girl group Weeekly.