I am trying to book multi city routes and each route is available when i search it as one-way.
But when i try it as multi city, the error message appears.
Is the fare issue and QR blocked the booking?
Even the partial trip (open-jaw ticket) is not available.
Should I book each ticket as one-way?

KWI-OTP
OTP-ICN
ICN-KWI

No fare can be found for the flights and/or cabins you selected. Please search again and select another cabin and/or different flights. (5685 - 2201)