Football: Starting from the 2005 World Youth Championship

What is the most regrettable moment of Chinese football?

Was it the 2002 World Cup where they failed to score a goal and were eliminated?

Was it the humiliation of the 2004 Asian Cup final where the Japanese team stole the championship with a handball in their home stadium?

Or was it the talented national youth team in the 2005 World Youth Championship that carried the hopes of countless people, but fell apart and became insignificant because of the 2:3 loss to the German team, which led to Krauthen's dismissal?

If time could go back and the national youth team defeated the German team, how would history change?