Section 4 is called № 17 that is later revealed to be the number of the door Beomgyu sees that apparently is a hotel room. He pre-opens it to see, himself holding a book, as if protecting it from the two men that were coming closer to him.
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This is the same book that Soobin had found in the beginning of the MV.
He tries to escape, but the man pushes him back, making him fall and drop the book. Beomgyu later witnesses himself from the room turn into a monster.
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And then the phrase appears that says "Which one should I trust?"