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Hayakawa was born Um Hye-ryeon (hanja:) in Anyang, Gyeonggi Province in South Korea. She competed in archery in high school and was later a member of a professional team, though she never qualified for the South Korean national team. Hayakawa became a Japanese citizen in 2007 having left South Korea to study on an archery scholarship, enrolling at the Nippon Sport Science University.