In 1997, Soo-yeon was 15 years old and Hyung-jun was 12 years old.
In 2001, Soo-yeon was 19 years old and Hyung-jun was 16 years old.
In 2003, Soo-yeon was 21 years old and Hyung-jun was 18 years old.
In 2007, Soo-yeon was 25 years old and Hyung-jun was 22 years old.