I Found an Encyclopedia of the Backrooms

After Xiao Jichuan happens upon an encyclopedia about the Backrooms, he clips into Level 0. Using the book, he gets through his first crisis. Later, on another level, he encounters Fu Yuchi, who has been wandering the Backrooms for a long time. The two decide to work together and find a way out.

A calm, rational, sharp-eyed archivist x a decisive, resolute, outwardly cold but warm-hearted former special forces soldier