I have a novel design of a single room in a tea shop. Can I apply for a patent? How much will it cost? Is the return big?

Copyright protects the work itself, while patent protects your "thought". Shop logo, you can apply for copyright or appearance patent. Very cheap, more than 2000 points. If an individual applies for copyright, the protection time is life+50 years after death. The patent is 20 years, and the annual fee may be more.