Junior Career

In the 2004–2005 season, Kim competed as a junior at the ISU Junior Grand Prix. She won a silver medal at the event in China and a gold medal at the event in Hungary. She won a silver medal at the 2004–2005 Junior Grand Prix Final with an overall score of 137.75 points. She retained her National Championship title for the third year in a row on her way to the 2005 World Junior Championships. At that competition, she won a silver medal earning 158.93 points and landed her first triple-triple combination jump in the free skating.

For the 2005–2006 season, Kim was not old enough to compete at the 2006 Olympics, instead, she competed in the 2005–2006 Junior Grand Prix and won both of her competitions in Bulgaria and Slovakia. At the 2005–2006 Junior Grand Prix Final, she won the competition 28.34 points ahead of silver medalist Aki Sawada. During her free skate, she landed seven triple jumps, including a triple flip – triple toe loop combination and a double axel – triple toe loop combination. Kim won her fourth senior national title. At the 2006 World Junior Championships, she won the gold medal scoring 177.54 points overall, with a 24.19-point margin of victory over silver medalist Mao Asada.