Info from WIKI

During the talent show, Jongpil plays the flute, but is discoved to have left a recording playing. He is boo'ed off of the stage. When 05 and the other variants started attacking the students, Jongpil remained in the gym with a few other students and teachers. He comforted a classmate when she vomited upon seeing the bodies of dead students. He followed the survivors to the staff room, where they remained locked up.