Today I went to college with a very good mood. There would be a quiz this noon, so I didn't want to mess it up, I built my good mood so that I could answer the questions. But! I met a wrong person at first, before I came in. I don't know how to explain, but I felt not good after had a short conversation with this person. 

I come with a conclusion that, not everyone you thought was good, is actually good. You have to be ready in meeting a really annoying people through your days. Yea I know this kind of thing is so natural. I know. I just want to, um, yeah, write it as my experience.

Don't expect too much that all people around you are as good as you thought. BUT, note this, you don't have to think negatively about them as well, stay positive. They are not worth it in getting you have a bad day.