Decoration design: My home has an actual area of 55 square meters, and I want to define a small room of about 5 square meters in the northwest corner of the house.

Is it used as a storage room? Whether it is reasonable or not, whether it affects the overall layout depends on the on-site investigation and your own feelings. Just feel good.

It's cheaper to use gypsum board, but it's still bricklaying if it's durable. The partition wall can be painted in the same color as other walls or pasted with patterns, without affecting the overall layout.

If your overall layout refers to feng shui, I can't answer you. See if any experts can give you some advice.