She was a member of girl group Jewelry and featured on the reality show We Got Married with Crown J. In May 2012, Seo established her own private entertainment company, IY Company.
Ia adalah anggota grup vokal perempuan Jewelry dan tampil pada acara realitas We Got Married dengan Crown J. Pada Mei 2012, Seo mendirikan perusahaan hiburan swastanya sendiri, IY Company.