It might be based on your country of residence. and Time of travel.
And also simply, it might be that literally no one uses the KE website in Switzerland so they do rely on AirFrance and more popular sites.
Try searching the Korean page since you're coming from Seoul. They often have discounts, but not to Geneva. Just their nonstop flights. It might be that the connection is jacking up the price.
https://www.koreanair.com/content/ko...ket.html#step1