Health Seong Si-kyung Reveals Diet Struggles After Cosmetics Model Offer by Dr Natalie Singh - Health Editor June 30, 2026 by Dr Natalie Singh - Health Editor June 30, 2026 Singer Sung Si-kyung recently confirmed he underwent a weight loss regimen to meet a cosmetic brand modeling offer. During an appearance on the YouTube channel Zzanhanhyung Shin Dong-yup, the artist … 0 FacebookTwitterPinterestEmail