In the summer of 2003, Brazilian star Kaka stepped into Milan in a low-key manner; Portuguese young player Cristiano Ronaldo flew to Manchester with controversy behind his back; the unknown Messi looked up at La Macia and looked up at the newly joined superstar Ronaldinho... In an unknown Dutch team, a waste who was about to be eliminated was looking forward to becoming the world's top superstar and set off a super front-line violence in European football.