It is appropriate for you to use the red line as a partition, not because of the sofa, but because people in China are forbidden to eat in class. At least don't just come in and look at the restaurant.
You built a small porch, right next to the restaurant. Five or six cupboards will do. You can even put lucky products, fortune trees and the like on it for decoration.
Looking at the pattern in the picture is not good for the owner. It is suggested to place bronzes or big bronze bells in the northwest (or restaurants).