What is F-2-81?
The code appears exactly once in either manual, in visa-3.txt (stay/residence management manual), as part of a section heading covering status-change to residence (F-2) for foreigners who invest in tourism/resort facilities (관광·휴양시설 투자이민제도, i.e. the real-estate investment immigration program). The heading pairs F-2-8 and F-2-81 together and is never split apart again in the section that follows: the eligibility criteria (investment above a threshold amount, by the investor, corporate officer/major shareholder, or accompanying family), the pre-screening procedure, applicant categories (등기완료자/콘도 등 회원/연계 투자자), review criteria, and required-document list all apply undifferentiated to '관광·휴양시설 투자 외국인' as a group — no separate rule, threshold, or document is attributed to F-2-81 alone anywhere in the text.