The young girl goes missing, and Hwa Sun searches everywhere for her. When she finds her, she realizes she is within a religious cult that won't let go. Meanwhile, Tae Han makes his way to Muji Hospital with another survivor, and Mujin High School locks their doors to anyone outside. 

Tae Han and the officers continue to look for the survivors in Muji Hospital. However, they get a strange feeling something is following them. Meanwhile, at the school, Hwa Sun and a few risk their lives to fetch medicine from the nurse's office. But one of them abandons them to save his own life, leaving Hwa Sun against the mutants all on her own.