To be an NPC in an infinite stream

At the beginning, the heroine wanted to let the people who came in pass easily. Hello, Hello, everyone. Who knows, after those people passed easily, she was locked into a dark nothingness world. There was no light or sound around. Just when the heroine was about to be driven crazy, She got the chance to be boss again this time, the hostess decided to seriously create problems for those who break through the pass. Make sure that none of the people who come in can get out.