There are a lot of small black insects in the house tonight, the living room, the room, you can see

That's a beetle, usually a beetle doesn't take the initiative to bite, some have a hard palate, like two pincers, and when you grab it, it will resist biting. Most of the beetles live on plants, animal feces, carcasses, etc.

How old is it? It looks like the bugs in the red beans I used to have, check to see if your food has any worms.

This is obviously a cockroach!! I saw it when I was staying at New Oriental English School!!

It's that your room is too damp.

It's not poisonous, and it doesn't bite.

This worm bites.

Beetles, eat plant leaves, don't bite you, because you're not plant leaves.

It doesn't bite, it's non-toxic, it's mainly afraid of cold, so it's only available in summer.