Seoinyoung dominates the stage at 'Waterbomb Sokcho 2026' with a 46kg weight loss and a white bodysuit

Singer Seo In-young took the stage at ’Waterbomb Sokcho 2026,’ held at Hanwha Resort Seorak Sorano in Sokcho, Gangwon, delivering a sensational performance. She appeared with short, bleached blonde hair, a dazzling white bodysuit adorned with decorations, and long boots, capturing the audience’s attention. On stage, she performed her hit songs such as ″Cinderella″ and ″Thank You″ consecutively, presenting a highly polished performance together with the dance team HOOK. Seo In-young revealed that she lost 4kg over a month for this stage, reducing her weight to 46kg. She shared that she underwent a strict diet consuming only eggs and protein, and even had arm liposuction surgery and laser treatments. She also stated that she used her entire appearance fee for preparing the performance, saying, ″It was definitely because of Waterbomb. I put my life on the line.″ Moved by the audience’s cheers during the performance, she showed tears. Although she briefly lost her place in the song, she soon finished the stage. Through her YouTube channel ″Reformed Seo In-young,″ Seo In-young expressed her determination to appear at Waterbomb and shared her preparation process, including weight management and performance practice before the show. Before the stage, she also revealed practicing 13 songs in a row. Seo In-young debuted in 2002 as a member of the group Jewelry, gaining recognition with songs like ″Superstar″ and ″One More Time,″ and later released solo hits such as ″Cinderella,″ ″I Want You,″ and ″Let’s Break Up.″