One day, a man asked me, "Yuli, why you always look sad most of the time?"
I could not answer him that time. But here is the answer. If there is anyone ask me the same question in the future, then I'll give him/her to read this. :p
http://introvertdear.com/2016/08/02/im-an-infj-and-i-have-resting-sad-face/