Sui and Han made their international debut in the 2009–10 ISU Junior Grand Prix, where they won the gold medal in their two events. They went on to win the gold medal at the ISU Junior Grand Prix Final. They then won the 2010 Chinese Figure Skating Championships and earned a trip to the 2010 World Junior Figure Skating Championships, where they won the gold medal. They became the second Chinese pair to win the World Junior Figure Skating Championships after Zhang Dan &amp; Zhang Hao, who won the title in 2001 and 2003.