Yeri joined SM Entertainment after auditioning at the SM Weekly Audition in 2011 . In 2014 , she performed as one of the upcoming members of SM Entertainment 's pre-debut training group SM Rookies on SM Town Live World Tour IV . She had a brief appearance in the introduction of Red Velvet 's debut song , " Happiness " , before debuting as a member
SM Town Live World Tour IV
SM Town Live World Tour IV
Yeri (singer)