Exhibition – How to take a dark photo of a dark room?

I was trying to take a picture of a room at sunset. There were no artificial lights and the room was quite dark, it was hard to read but it was not dark. I adjusted the parameters so that the exposure meter in the camera was balanced in the center. I expected the photo to have many dark tones. But the photo was well lit. In fact, in the photo, the room seemed brighter than it really was. What is hapening here? And what can I do to capture the dark shadows?

I was filming with a Nikon D7200 and a 50mm F / 1.8 lens.