Y = Economy (80,000 return from Korea to Europe)
J = Business (120,000 return from Korea to Europe)
F = First (160,000 return from Korea to Europe)
The above mileage amounts are for Star Alliance airlines. Etihad is the same. Asiana is marginally fewer miles.
The link below lets you see required miles.
https://flyasiana.com/C/US/EN/contents/mileage-tickets
If you are adamant about flying TK and EY you will need to be very flexible with dates. You will need to see which airlines have availability. I much prefer to fly ANA, Thai, EVA or Singapore over Turkish or Etihad.