They became the first quadruple world championship holders in the country after taking the first places at the women's individual 69kg and 75kg sparring matches of the 20th Taekwon-Do World Championships held last year.

Sin held the championship at the 15th, 18th and 19th Taekwon-Do world championships and Kim at the 17th, 18th and 19th Taekwon-Do world championships.

Sin bagged gold medals at the 7th World Juvenile Taekwon-Do Championship and the 4th, 5th and 7th Asian Taekwon-Do championships, while Kim at the 9th World Juvenile Taekwon-Do Championship and the 7th and 8th Asian Taekwon-Do championships.

They were awarded the title of People's Athlete.