The title mentions Seoul, but the resolution rules explicitly specify the Incheon Intl Airport Station. Incheon is coastal and its temperatures often differ noticeably from central Seoul, posing a trap for traders who only read the title. Additionally, the resolution uses whole degrees Celsius, adding a layer of precision risk.

April 16, 2026 - April 17, 2026, the price of the '21°C or higher' option surged from 26c to a peak of 78.5c (currently settling around 76.5c). This was driven by unseasonably warm weekend weather warnings from the Korea Meteorological Administration, forecasting early-summer-like temperatures (reaching 21-23°C in Incheon) which drastically shifted market expectations for Incheon Airport. April 16, 2026 - April 17, 2026, prices for lower temperature options such as '15°C', '16°C', and '17°C' plummeted (e.g., 15°C dropped from 20.5c to under 1c), also as a direct result of the updated heatwave forecasts pricing out the likelihood of cooler temperatures.

April 16, 2026 - April 17, 2026, the price of '31°C' surged from 22c to 37.5c, and '30°C' temporarily spiked from 20c to 40c. Meanwhile, '28°C or below' plummeted from 26.5c to 5.5c. This occurred because, as the target date approached, updated meteorological models ruled out lower temperature extremes and revised the expected high upward into the 30-31°C range.

The title mentions 'Seoul', but the rules strictly use data from the Incheon International Airport Station (RKSI). Incheon is coastal and its temperatures often differ significantly from central Seoul, potentially misleading title-only bettors. Additionally, data is rounded to whole degrees Celsius.