Can I apply in Busan university of foreign studies in south korea for commerce?

Yes you can pursue commerce at the Busan university of foreign studies. Here is the eligibility criteria for getting into the university:

Online application
Application fee KRW 60,000
Applicants who have completed (or expected to complete) a regular high school education
Recommendation letter written by his/her home university
Interview score 60 points out of 100 or higher
TOPIK (Test of Proficiency in Korean) level 3 or higher
TOEFL iBT 53 or IELTS 5.5 or TEPS 600 or higher
If you have any further questions just ask me.