Jinjiang authors often say that going to the little black room in the secret code refers to

The little black room is a tool for forcing code words, and its full name is called "Little black room software for forcing code words".

It creates a peaceful writing environment for you, thus greatly improving the writing efficiency. You can set the lock time or the number of words, and you will not be able to quit the software until you finish the task you set. In this troubled world, you can find a quiet and secluded space for yourself. In this space, all you have to do is code words.

After entering the interface, my eyes were dark. Don't panic. This is the writing interface for you. The current network is really chaotic. A simple and undisturbed interface may help you find a quiet writing state. If there are green characters on a black background, you really don't like it. It doesn't matter, the color and font of the interface can be set at will.

Basically, the author went in and couldn't come out unless the number of words and time were up.