I managed to take a macro photo of this little guy with my phone while I was on my way to work today.
He was just about to enter the house. There are quite a few of them in houses; they are small and harmless.
Among the various types of spiders we have here, like house spiders, orb-weaver spiders, and black widows, this little guy, along with the common house spider, is the most harmless.
So we don't kill them because, although they make small webs, flies, mosquitoes, and other small flying insects get caught in them.
This makes these little spiders useful. Additionally, we have a saying that if a spider enters the house, it brings money, so we let them come in freely and make their small webs.