Ki was selected for the South Korean archery team alongside Joo Hyun-jung and Yun Ok-hee to contest the 2010 Asian Games in Guangzhou. Although eliminated by Cheng Meng of China in the quarter-finals of the women's individual competition, she won the gold medal in the women's event with Joo and Yun after the trio defeated the Chinese team in the final. At the 2011 Archery World Cup's second stage in Antalya she achieved a further team gold medal as well as a silver medal in the individual competition, finishing as runner-up to teammate Jung Dasomi. She later took what would be the first of three mixed team titles at the 2011 World Archery Championships.