Zombie friend

There is no friend who helps Jin-il and Go-bong who are subjected to school violence, and Jung-woo, who was a friend, but everyone turns a blind eye. One day, Ddawang is bullied by Jinil and Gobong and trapped in the bathroom while cleaning up scientific chemicals. And the king turns into a zombie, the children gradually become bitten, and then into a zombie. The plot is that friends and teachers who find out the contents of the zombie notebook found in the library and learn how to cure the problem together.