Nama Asli : Ong Seongwoo (옹성우)
Label : Fantagio Entertainment
Tanggal Lahir : 25 Agustus 1995
Tempat Lahir : Korea Selatan
Blood type: A
Berat : 63 kg
Tinggi : 179 cm
Keahlian: drums
Masa Training : 8 Bulan
Posisi : Sub-Vocal, Main Dancer
Grup : Wanna One
Last Word: " I will work harder than anyone, develop quickly, and do well."
