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Let's see if the water pipe in the bathroom is closed, and there is usually a valve for the water inlet.
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Your bathroom should have a water valve, it may be that your bathroom water valve is turned off.
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It should be one for the water in the tower and one for the groundwater.
The water outlet goes through the kitchen and then to the bathroom. There was a problem with the water pipe between the kitchen and the bathroom.
The kitchen and bathroom are two pipes with different wiring, which may be due to the long use of the faucet and the clogged filter at the outlet. >>>More
Is there another door that is not opened, look for it along the pipeline.
See if the main valve is not open.
That's the credit of the water elbow, which can store water, that is, to prevent the smell of the sewer from entering the toilet.