Hardy, Belgium were fairly poor in all three matches; what I'm saying is that if they were in a stronger group, they'd be going fishing right now. They didn't play as a team, but they have a lot of individual quality and a lot of players who can take on their man, plus a solid defense/keeper, so they can progress. This certainly isn't the Belgium we saw in WC Qualifying and friendlies. They were open and expressive, with powerful runs, headers, long shots, and counters. In the WC, Belgium has just played like a team burdened with too many expectations and it hasn't worked at all.
You can't expect to progress in the knockout stages if you're only scoring goals from the 70th minute and later, as well as relying on last ditch tackles to deny runs. Oh, and let's say that Defour got himself sent off in the knockout stages. Well, Belgium would've been knocked out in the tournament. South Korea weren't that bad, but they failed to pressure Belgium at all, even when up a man.