1. slug: slug is a mollusk that looks like a snail without a shell. They usually live in a cool and humid environment, such as rainy days.
2. Booklouse: Booklouse is a common indoor pest, which usually forms a community in bookcases and wardrobes. They belong to rodents, a variety of ancient insects.
Due to the limited information provided, it is impossible to determine the exact identity of this bug. If more accurate identification is needed, please consult a professional entomologist or biologist.