There was no attempt to play the game and each team was intentionally flipping the bird into the net. They were warned by the ref and ordered to play but they ignored him. The disqualification was well deserved, but I suspect the teams were ordered by their coaches and team officials. People who payed good money for tickets to this event were mad as hell!
China did not want to meet the other Chinese team until the final when they could play each other for gold and silver. Korea wanted to avoid playing the other Chinese team as well, hoping for an easier match.
Says damn little about the spirit of competition, but greed and national interference, fixes and bribes, have sadly ruled the Olympics for many years!