Earlier this week, Lufthansa announced a down-gage in aircraft that will affect service between Frankfurt and Seoul, South Korea during February and March 2016.
Beginning on February 4, Lufthansa will replace the 747-8i that typically flies the route with a 747-400. The 744 will be a 3-class (Business / Prem. Economy / Economy) aircraft and will fly between Frankfurt and Seoul until March 25 at which point the 747-8i is expected to return to the route. First Class will not be available on the route during this time.
Typically these changes are made to reflect the passenger loads that LH expects to see during this time of year and the 747-8i will be redeployed on busier routes.
PLEASE NOTE that First Class will still be available between Munich and Seoul during this time frame.