- Stage Name: Jaehyun (재현)
- Birth Name: Jung Yoon Oh (정윤오)
- Birthday: February 14, 1997
- Zodiac Sign: Aquarius
- Birthplace: Seoul, South Korea
- Height: 184 cm
- Weight: 63 kg
- Blood Type: A
- Group: NCT
- Position: Lead Vocalist, Lead Dancer, Sub Rapper
- Sub Group: NCT U, NCT 127
- School Seoul Performing Arts (SOPA) (Graduate)
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