Yang is perhaps best known for being one of the athletes involved in a major judging scandal at the
2004 Olympics. In the all-around, Yang finished third, behind his teammate
Kim Dae-Eun and American
Paul Hamm. When Yang performed on the parallel bars, one of his elements was mistaken for a simpler skill. Consequently, his routine only received a start value of 9.9. The Korean Olympic Committee, Yang and his coaches filed a protest about the results, and an investigation was opened. After reviewing the situation,
International Gymnastics Federation (FIG) officials acknowledged that the SV for the routine had indeed been incorrectly calculated, and suspended the three judges responsible for the error but ruled that there was no way to change the results after the meet had concluded. A major point of contention was the time at which the score protest was filed. Under FIG rules, score protests must be filed immediately, during the actual competition, to be considered. The Korean Olympic Committee claimed that one of the judges on the parallel bars panel, Kim Dong Min, noticed that the Start Value was amiss during the competition, informed Yang's coaches directly after the meet, and that a protest was lodged around the time of the medal ceremony. The FIG stated that in fact, no protest had been filed until later in the day, when the athletes were leaving the arena. On August 28, 2004, Yang and the Korean Olympic Committee filed an appeal with the
Court of Arbitration for Sport. Arbitrators Michael J. Beloff (United Kingdom), Dirk-Reiner Martens (Germany) and Sharad Rao (Kenya) deliberated over the case for several months, during which time Paul Hamm was called to Lausanne to speak at a hearing. On October 21, 2004, the CAS announced that the case was being dismissed. The two main reasons given for the dismissal of the case were: • Whether the score protest had occurred according to the KOC or the FIG's version of the events, it had still taken place after the conclusion of the competition, and thus was not valid under FIG rules. • The judging could be considered a "field of play" decision, and could not be rescinded after the fact to change the results. After the Olympics, the Korean Olympic Committee awarded Yang a symbolic gold medal, expressing their support. They also gave him the same $20,000 prize awarded to gold medalists. == Post-competitive career ==