• Providing service to customers (고객 서비스 제공) • Creating a new portfolio of customers (고객을 위한 새로운 포트폴리오 작성) • Doing market research and determining potential customer (시장조사 및 잠재고객 결정) • Presenting product to customers (상품 프리젠테이션 진행) • Organizing installation of product (상품 셋팅 관리) • making out invoices (인보이스 발송) In my opinion, the first sentence is a little vague for your CV, since "providing service" can be anything that matters. I think it would be better if you specify more clearly.