United won 4-0 at FC Seoul yesterday in front a sell-out 65,000 crowd with goals from Cristiano Ronaldo, Chris Eagles, Wayne Rooney and Patrice Evra.
Ferguson:
"This is Manchester United's first visit to Korea - and I am sure we will be coming back.
"The reception we have received here has been absolutely excellent. Everything about the trip has been first class.
"I used to think when we went to Thailand it was almost impossible because we had thousands inside and outside the hotel all night. We have experienced the same thing here.
"It doesn't surprise me. It is just one of these phenomenons we can create in certain parts of the world."