Judo athlete Jung Su-jin disqualified over 100 grams: The flaw in the random weigh-in system

The weigh-in room had no spectators. Just a digital scale, a board with a number, and women in team jackets waiting in silence. I have sat in many judo weigh-in rooms over the years, and there is always the same moment: before the number appears, everyone holds their breath. This time, the moment lasted longer than usual. Jung Su-jin stepped onto the scale for the competition-day random check. She had passed the official weigh-in the day before, and had eaten and drunk to recover. The scale read 50.5 kg. The permitted limit was 50.4 kg. Over by 100 grams. One hundred grams. The weight of a small packet of sugar. And it was enough to erase her from the tournament — and, in her own words, possibly from her career. The lightest women's judo category at the Olympics is -48 kg. With the 5% tolerance the International Judo Federation (IJF) applies to the random weigh-in, the ceiling is 50.4 kg. The arithmetic — 48 × 1.05 — confirms the class is -48 kg, the lightest, and the most brutal when it comes to weight management. This rule was not created to catch cheating. It was created to save lives. In judo, athletes have long used rapid weight-cutting tactics — fasting, restricting fluids, sauna sessions — to make a lower class. Severe dehydration can lead to kidney failure, cardiac arrhythmia, and in the worst cases, death. The official weigh-in takes place a day before competition. The random weigh-in takes place on competition day, about an hour before the bout, to ensure athletes do not over-recover after making weight. This is a system designed to protect. In Jung Su-jin's case, it operated as a trap. The list of athletes selected for the random check is finalized about an hour before competition and passed down through the national team's coaching staff. There is no independent verification channel for the athlete. She only learned her name was on the list when it was too late. I have witnessed similar scenes in early mornings in Busan, when the training ground is empty of spectators but the pulse of the work still echoes. The athletes and players I follow share one trait: they live in a complicated relationship with their own bodies. They know exactly how many grams they weigh each morning. They know how much water they are allowed. They know that one mistimed meal can ruin months of preparation. In the -48 kg class, that pressure is at its most extreme. Because it is the lightest class, the margin for weight management is the narrowest. There is no room for error. An athlete in this class cannot "lose a little more" if the body is already at its limit. She can only choose a more dangerous method. According to Jung Su-jin's account, the coaching staff told her twice that she was not on the random check list. Twice. She trusted that information, ate and drank to recover after the previous day's weigh-in. When she discovered she was in fact on the list, she had about 15 minutes before the deadline. In those 15 minutes, she did what any athlete in a similar situation might do: she cut her hair to shed a few grams, and induced vomiting to expel food and water from her body. She was still 100 grams over. And she was disqualified. This is where I want to pause, because the story here goes beyond a number. Technically, the disqualification was correct under the rules. The limit was 50.4 kg. She was at 50.5 kg. The rules mandate disqualification. There is no grey area. How responsibility was allocated is the real issue. The athlete bore the heaviest penalty — losing her place, her opportunity, her dignity. The proximate cause was misinformation from the coaching staff, delivered twice. Had the staff been correct from the start, she would have had the whole day to manage her weight safely. Instead, she was forced into 15 minutes, and those 15 minutes compelled her to do things harmful to her body. I once stood in the mixed zone in Saint Petersburg in the summer of 2026, when Korea beat Germany 2-0. I saw Son Heung-min cry. But I also saw goalkeeper Jo Hyeon-woo sit alone in a corner of the dressing room for 15 minutes, face in his hands. That unnoticed moment taught me that in sport, defeat and damage often lie where no one is looking. In Jung Su-jin's case, the damage lies in 15 minutes no camera recorded. In the sound of vomiting, of cutting, of gasping in the weigh-in room. And in her words afterward: she felt "extremely ashamed," her mental state was "unstable," and she "may no longer have the chance to continue her athlete career." I am a beat keeper — not for the match, but for the stories on the margins that bleed by the minute. And this story bleeds from a very specific place: the silence of a system that cannot withstand error. There is another reading that I believe is necessary, even if it is not easy to hear. The random weigh-in rule exists for a good reason. But it places a burden on the athlete: even when told she is not on the list, in theory the athlete must still self-monitor her weight. This is an unresolved contradiction. If the rule requires the athlete to be responsible for herself, then the coaching staff's misinformation — however serious — does not fully absolve the athlete. This is a view few want to voice, because it places part of the responsibility on the person who is already suffering. But voicing it matters more than criticism. If we only blame the coaching staff, we miss the bigger question: why can a system designed to protect athlete health be disabled by one wrong phone call? Why is there no direct verification channel for the athlete to check her own name? Why is the notification window only one hour? A good system should not depend on no one making a mistake. It should withstand mistakes. Alongside this is another matter complicating the picture: a travel-management controversy, in which the team was said to have missed a connecting flight in Dubai. When two operational failures occur in the same cycle, people begin to ask about a systemic problem, not just individual error. What is notable is how these two incidents complement each other. One was a competition-day operational failure — wrong information about the weigh-in list. The other was a logistics failure — flight management. Both belong to the coaching staff. Both point to the fact that the problem is not one individual making a mistake, but a process with no cross-check point. The head coach has resigned and accepted "full responsibility." The Korea Judo Federation is expected to issue its disciplinary decision on October 16. This is the pivotal moment. The severity of that decision will set a precedent for coaching-staff accountability in athlete weight management. From Busan to Russia, I have learned that a season never ends with the final. It ends in small moments no one records — a wrong phone call, a missed name, a 15-minute window. Those moments do not appear on the scoreboard, but they shape people's careers. When the stands are empty, I hear the breathing of the athletes more clearly than ever — a sound no broadcast can capture. And in that silent weigh-in room, I heard something else: the sound of a system asking itself whether it is protecting the athlete, or protecting itself. Jung Su-jin may never step onto a major mat again. But if her story forces the Korea Judo Federation, and perhaps the IJF, to revise the random weigh-in notification chain — adding an independent verification channel, extending the notification window, or giving athletes the right to check for themselves — then those 100 grams will not be entirely meaningless. The issue is not who is at fault. The issue is: how many more athletes will have to vomit for 15 minutes before someone agrees to fix the system?