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Midweek availability at under £1,200 looks pretty good for the most of the year.
Google Flights is showing the fares at a little over £1,300, but if you use a site like Momondo to search, you should be able to find the cheaper fares available via online travel agencies:
Obviously, you will have to connect in Amsterdam/Paris which adds on a few hours compared to flying direct, but the savings are substantial. For random dates when the KLM/Air France fare was £1,120, direct Business Class flights looked to range between £2,080 and £2,939:
Air France and KLM Business Class may not be world-leading, but it should still provide a comfortable and enjoyable way to fly over to Korea. It’s rare to see such good Business Class deals from London, and particularly to North Asia.