Euddeum Shim set Instagram ablaze on March 18, 2026, sharing a euphoric moment from the Seoul Marathon—beaming as she sailed past the 41-kilometer (about 25.5 miles) mark. In her post, she wrote, "I was grinning ear to ear at the 41k mark—I did my best to enjoy it without pressure. So proud." She emphasized that she ran this marathon to have fun while giving it her all. Alongside the warm, heartfelt photos, she also uploaded a Seoul Marathon recap on YouTube. The post quickly won fans over, drawing comments like "You did so well~," "You’re so beautiful," and "This photo is insane!!"