Talk about moldy new year's goods.

The most direct reason why the house is moldy is the high indoor humidity. If the weather is wet, it can be solved by ventilation. However, if the tenant in the room closes the doors and windows and cooks in it, the moisture can't get out.

In this case, it's the tenant. Of course, it is not a good conclusion, because the tenant said some other reasons. In a word, you should be prepared to bear the loss.