South Korea managed a 2-0 win over Greece on Saturday and the Manchester Untied ace scored the second goal of the game.
Park said: “Argentina is, of course, the strongest team in our group and people are saying they could make the final. They have a lot of top international players.
“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.”