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Yoo, a KAIST graduate student researching AI semiconductors and popular running content creator, lost consciousness at the 20.6-kilometer mark of the 2026 Seoul Race on October 11. Medical staff gave her CPR on site and rushed her to a hospital, but she was pronounced dead; the cause remains undisclosed. Fellow runners shared tributes noting her bright smile in pink tops and sunglasses during races, her sub-three-hour Seoul Marathon finish earlier that year, and her win in a 10K masters event, while sparking talks on the risks of intense endurance training even for fit athletes. Organizers offered condolences and plan to review the incident.