Two nations advance to the quarter-finals from Denmark's group, which, in addition to South Korea, also includes Taiwan and Sweden.
The battle for further advancement is probably between Denmark, South Korea, and Taiwan, as Sweden is considered to have no great chances of success.
The first Dane in action on Friday was Anders Antonsen, who got off to a bad start but won in three sets over Yoo Tae Bin, the World No 66.
Later, Daniel Lundgaard and Mads Vestergaard were convincing in doubles and won in two sets over Kim Won Ho and Ki Dong Ju.
Magnus Johannesen was then called into action in singles against Choi Ji-hoon.
Johannesen won through a scoreline of 21-12, 17-21, 21-15. He was behind midway through the third set, but was able to pick up the pace and take the set in confident style in the end.
Denmark now has two matches remaining to put further distance between themselves and South Korea.