- Stage Name: Johnny (쟈니)
- English Name: John Seo
- Korean Name: Seo Yeong Ho (서영호)
- Birthdate: February 9, 1995
- Birthplace: Chicago, United States
- Height: 184cm
- Weight: 63kg
- Blood Type: B
- Specialties: Dancing and Piano
-  Areumdaun Geudaeege (Extra)
-  EXO 90: 2014
- He was accepted to SM Entertainment in 2007 with the system SM Global Audition in Chicago.
- He is a close friend of Tao and Se Hun of EXO.
- He was SM Entertainment trainee for 8 and a half years.