Why did they have plans to build Seoul Incheon International Airport Terminal 2 elsewhere?

#SeoulIncheonAirport #Airplane #Airport
Seoul Incheon International Airport, which opened on March 29, 2001.
17 years later, on January 18, 2018, Passenger Terminal 2 opened
But
The originally planned location of Terminal 2 is not the current location.
It's said it was a different place.
Where was the original plan?
Why did the plan change?
I'll look into it from now on.
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