What is D-9-4?
The manual explicitly ties the term 개인사업자 (individual business owner) to code D-9-4 in a footnote under a regional-visa (지역특화형 비자/F-2-R) section, drawing a parallel: for corporate entities the parallel investment-capital rule is 법인투자(D-8-1), for individual-entity applicants it is 개인사업자(D-9-4). Independently, two other places in the manual (visa-2.txt ~3711-3728 and visa-3.txt ~4376-4390) describe the substantive '외국인 개인사업자' status requirements under the 무역경영(D-9) parent category without repeating the D-9-4 code, but the content matches: (1) a foreigner who has brought in foreign capital above a prescribed threshold under the Foreign Exchange Transactions Act and completed VAT-law business registration to run a company or for-profit business; (2) a foreigner who registered a foreign-invested individual business under the Foreign Investment Promotion Act with capital above a prescribed threshold; (3) a Korean-university master's degree holder or expected graduate holding D-2 or D-10 status who invests 1억원 이상 (of which up to 5,000만원 may be domestically raised, with the remainder required to be genuine imported foreign capital under FETA) and completes VAT-law business registration; a carve-out allows bachelor's-only graduates to qualify instead by earning 총30점 이상 in the '창업이민종합지원시스템(OASIS-1부터 8)' program.