(The following content is all personal opinion, second brush, screenshot)
The ultimate mastermind I feel should be the girl who came to apply for the job: Abby.
①First of all, when she came for the interview, she felt like the kind of "old driver" who didn't panic.
② Before the opening of the second intimidation show...
These actually imply that Abby is a fan of "Mask Freak".
③The performance is about to start. Abby hurriedly messaged someone "I have to go, it's about to start"
These suggest that Abby and the "Mask Freaks" are a gang. She is a fan of "Masked Freaks", giving them ideas, cooperating with inside and outside as a traitor, and came to audition for the "Scare Show" program.
④In the end, everyone died, and the man went into the incinerator. In the car, the heroine was still in shock, thinking that she had escaped and everything was over. But found that Abby was very calm. I noticed the in-car camera again, and understood everything: the "Mask Freaks" show continues...
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