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The Most Popular Book on the SCP Foundation on This Website

I watched it a few years ago, but I can't find it now. I only remember that the protagonist is a D-class personnel. He escapes from the mouth of 682 at the beginning. The heroine is 166. It seems that it can invalidate the ability of contained objects? Contents such as Dr. Monkey, Cain, God, 682 Barbeque, etc. Appear in the book