 Complete the following phrase:  After making his debut for the South Korea U-20 in August 2002, Choi was called up to the South Korea U-23 squad for the Asian Games, where he helped the side finished third place, earning a bronze medal. He then returned to South Korea U-20 squad, being called up for the AFC Youth Championship in Qatar. He started in the tournament and helped Japan reached the final. Choi started in the final against Japan U-20 and beat them 10 to help South Korea U-20 win the AFC Youth Championship. A year later, he was called up to the South Korea U-20 squad for the 