ATEEZ's Hongjoong participated in the 'Global 6K Marathon Campaign' held at the Peace Plaza of Seoul World Cup Park in Sangam on the morning of June 20, 2026. Various celebrities including actors Park Sang-won, Choi Gang-hee, Lee Se-hee, broadcaster Jung Hyuk, Philippine ambassador Bianca Umali, and YouTuber Stone Running attended despite rainy weather. Hongjoong appeared wearing a headband and delivered a message about resolving water sanitation issues. The campaign is a charity run where participants walk or run 6km, the average daily distance African children walk to obtain clean water, to raise awareness about the importance of clean water and the severity of water sanitation problems.