Can blood type and constellation really determine a person's personality?

No, most of them are just psychological hints. If you know that you are type B blood, you may think that you have the characteristics of type B blood. In fact, later you know that you are a, then you will deny the previous view that I am a strange type. It used to be a little different.

But if you want to observe a person, this is a good environment to cultivate a person's character, of course, it has nothing to do with these! Because everyone has this kind of consciousness to hint at themselves.