Put it in the box, not in the bedroom. Knife, gun and armor are all like this. Don't let them be exposed. This is what China people call a "master".
It's a good thing that someone took your sword in the dream, which means its murderous look didn't hurt you. Put it in the sword box quickly.
This kind of thing is even more so in ancient times. Not only killed people, but also experienced inexplicable hands. Antiques are particularly delicate. The best fate is that you get it through a domineering and murderous person (such as a former armed police) and it is resolved.