She won the women's flyweight (under 51 kg) gold medal at the 2008 Asian Taekwondo Championships.

After her suspension, in May 2011, Yang competed at the 2011 World Taekwondo Championships held in Gyeongju, South Korea, and won a silver medal in the –49 kg category losing to China's Wu Jingyu 6–2 in the final.

[2] At the 2010 Asian Games in Guangzhou, China on November 17, she was controversially disqualified near the end of the first round when she was leading 9-0 against her Vietnamese opponent Vu Thi Hau.

After Yang's ruling, some Taiwanese people even started a boycott of Korean products because they think South Korea controlled all the major positions in the world taekwondo body that oversees the sport.

In response, the Ministry of Foreign Affairs of South Korea said, "The disqualification of Yang Shu-chun at the Games is regrettable, but there is a need to pay attention to the burning of South Korean flags and boycotting of products that are spreading across the island.