Scroll down and click on 신청 next to the 고용/산재보험 자격 이력 내역서 (고용/산재보험에 가입되었던 전체 이력 인쇄). You can also select the companies that you want to display in the document. However, from my research online, usually they employers want to check the full history. Always confirm with your new employer in case you are unsure.