- Stage Name: Johnny (쟈니)
- Korean Name: Seo Young Ho (서영호)
- English Name: John Seo
- Birthday: February 9, 1995
- Zodiac Sign: Aquarius
- Place of Birth: Chicago, US
- Height: 186 cm
- Weight: 63 kg
- Blood Type: B
- Group: NCT
- Position: Lead Rapper, Lead Dancer, Sub Vocalist
- Sub Group: NCT 127
- Specialty: Rapping, dancing, playing the piano
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