So i just moved in and this afternoon, i heard a knock on the door and the guy in the bedroom next door enters. He sees me and goes 'oh, i didn't know you were here' and said he wanted to look at my room. I was a bit taken aback.
Anyway, so since I can't modify the doors, is there a way I can lock it or at least set up some kind of device/trap so i know if someone entered my room when i am away?
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