Where I live?(1)

I had lived in four places.
First, I was born in Osan.
And I moved to Hwaseong when I was 3 years old.
so I don't have memories about Osan. I just know where is the Osan.
I lived in Hwaseong until 19 years old.
and I moved to Suncheon. because my university was in Suncheon.
so I lived in a dormitory at my university. When applying for dormitories at universities, there are grade restrictions. So I had to study very hard in order to live in a dormitory.

I had lived in four different places.
First, in Osan where I was born. I have no memories of Osan. I just know where it is.
Second,  in Hwaseong where we moved when I was 3 years old. I lived there until I was 19 years old. 
I then moved to Suncheon where I studied and lived in a dormitory at my university.
When applying for dormitories at universities, there are grade restrictions. So I had to study very hard in order to live in a dormitory.