Dangun’s last descendant lives in the present world. However, because the reckless use of force is taboo, they’re doing ‘bread shuttle number one at school. If you can’t avoid it, enjoy it… As he was being patient and patient, he decided to be the number one shuttle and eventually became Nambawan. But now is the time to break the taboo to protect his family and loved ones. The story of Dan’s family, who desperately practices the ideology of Hongik Ingan from various gods, evil spirits, demons, and his descendants to take away the God of heaven, cheon-buin, unfolds.

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...