What kind of bug is this? It's urgent

According to the information you provided, it is impossible to determine the exact identity of this bug. But I can give you some characteristics of common household pests, so that you can judge for yourself.

-Booklouse: Booklouse is a domestic pest, which usually hides behind bookcases, wardrobes or wallpaper and feeds on various fiber products. They can bite the skin, causing redness and itching. Booklice like humid environment, so keeping indoors dry is the key to prevent booklice from breeding.

-Slug: Slug is a mollusk, belonging to Gastropoda, Stipula and Slug. They are called water dragonflies in some areas of southern China, and they are "three-legged" creatures that are easy to become sperm in folklore. Slugs usually live in a cool and humid environment and have wet mucus on their bodies, so they are sometimes used to make beauty masks or medicines.

-Acari: Acari is a pest of Acari, commonly known as Parthenocissus. Adult worms have shield plates on their backs and strong crusting ability, commonly known as Ixodes, belonging to Ixodes; Commonly known as soft ticks without shields, they belong to the family of soft ticks. Acari is a temporary parasite on the body surface of many vertebrates, and it is the transmission medium and storage host of some human and animal diseases.

If you find this bug at home, I suggest you take the following measures to prevent it:

1. Clean the home environment: clean the home environment regularly, especially in the corners that are prone to pests such as kitchens, bathrooms and bookcases.

2. Use insecticide: You can use household insecticide purchased in the market, such as spray and bait.

3. Keep indoors dry: Keeping indoors dry can effectively reduce the breeding of booklice and other pests who like wet environment.

4. Seek professional help: If the pest problem is serious, you can consult professional pest control institutions or professionals for help.

I hope the above information will help you, and I wish you an early solution to the pest problem.