All 40,000 tickets for United's pre-season friendly against FC Seoul in July were sold within hours of going on sale on Thursday.
Public sales for the Kumho Tires Cup game at Seoul's World Cup Stadium began at 10am BST and all seats were snapped up inside 10 hours.
Half went in the first hour alone to Korean fans eager to see United and national hero Ji-sung Park in action. The winger was injured when United last faced FC Seoul on the 2007 tour, the visitors winning 4-0 in front of 64,000 fans.
It demonstrates the Reds' phenomenal pulling power across the globe and especially in Asia, where the world champions will play four games this summer.
The July 24 fixture against the K-League outfit is the third game on the trip, which also takes in Malaysia, Indonesia and China. Read the latest ticket news here.
Yong Kim, of local promoters Mast Entertainment, said: �I am amazed at the enthusiastic support fans are showing for United and Ji-sung Park. I believe that the match will turn out to be one of the most memorable football experiences for many football fans in Korea."