Six strangers met in a mysterious enclosed s.p.a.ce. One of them claimed to be a “senior” and stated that among them there was a “Devil” who does not bat an eye at killing. How to avoid the “Devil” and escape from the world is the biggest problem they face. Mu Qin: I once had someone I really liked. He was very good to me, and always likes to dance in front of me with a knife. But one day, he went crazy.