Use when you need South Korea's official public holidays for a year (business-day calculation, scheduling, settlement calendars). Input: year (YYYY). Output: JSON list from KASI with date, dayOfWeek, nameKo, nameEn, isPublicHoliday, kind; includes substitute and temporary holidays once promulgated. Example: ?year=2026

Use when you need a quick market snapshot for a South Korean district-month instead of raw trades. Input: region (5-digit LAWD_CD, e.g. 11680), month (YYYYMM). Output: JSON stats from MOLIT data excluding cancelled deals: count, median/avg price and price per m2 and per pyeong in KRW and USD, breakdown by area class, top complexes. Example: ?region=11680&month=202409