한국에서 뭐했었나요?(what did you do in korea?)

I was a university student
My major is was mass communication - like journalism
My school life was boring and this year, i left on took a leave of absence from school because i was busy for on a working holiday and i wanted to study english. lastly, i was worried about my future employment of the future
and then i worked at a mart and department store so that i could saved money
I worked as in customer service in the mart and then i worked as a salesperson in the department
store. At that time, i got good experiences ! I learned about many things.

Notes:

Work on articles: A, An, The.

Your tenses should be consistent.

"take a leave of absence" is a set phrase.

If you work in customer service you are not a "customer servicer"

Good work. If you have questions let me know.