On March 18, 2026, Oh Sang-uk revealed on Instagram that he had joined a recent marathon in Seoul — surprising fans by saying it was a day of "pure joy," not competition.
In the photos, he beams while holding a medal against a bright yellow backdrop and powers through the course mid-run. Rather than chasing an elite-level time, he highlighted the memories and meaning that stayed with him.
Fans reacted with comments like "Wow!" and "So cool," also sending encouragement to the runners who took on the race alongside him.