While Seo Hye-jin has a track record of successful shows, this new audition program titled Under 15 is making headlines — but for all the wrong reasons. The program is recruiting children aged 3 to 15 from over 70 countries.While Seo Hye-jin has a track record of successful shows, this new audition program titled Under 15 is making headlines — but for all the wrong reasons. The program is recruiting children aged 3 to 15 from over 70 countries.