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Contemptible people, I thought that since the living room has become a small bedroom, why not hang the TV on the wall separated by the living room, now there is no separation, there is a strong hanging out of the separation, thank you landlord.
The toilet door cannot be sealed, and there is no place to open it. If you feel that the living room sofa is facing the toilet door, you can make a secret door.
Use damping acoustic panels, similar to plasterboard, but with excellent sound insulation.
It's just as decorated as a normal room.
Depending on your room type, you can usually use bricks, plasterboard or glass bricks. Of course, if the lighting is not good, it is recommended that you make a local partition.
At the very least, the living room needs to be large enough to not interfere with lighting, ventilation, passages, and load-bearing structures. The specific situation needs to be seen in the drawings of specific houses