Manchester United midfielder Park Ji-sung is convinced South Korea can upset World Cup group opponents Argentina.
Park, 29, was on target as Korea kicked off their Group B campaign in South Africa with a comfortable 2-0 win over Greece.
He said: "Argentina, of course, are the strongest team in our group and people are saying they could make the final. They have a lot of top international players.
"But before the World Cup, we played a friendly against Spain and we thought about Argentina as we were playing that game.
"Of course, there is a lot of difference between the two teams, but the unexpected can happen in this World Cup - and that is what we are looking to do."