Shinwoo receives a surprise as he opens the door of his apartment. He finds his school bag which he accidentally left behind at the scene of the fight the other day. He shows it to his friends assuring that it is his. Each of his belongings are there except one: a book (the kind you'll find in Shinwoo's bag). Little does he know that it was arranged as a warning from the Infected, intended to make shiver in fear of his coming danger.