| Full Name | Jeong Yun-o |
| Stage Name | Jaehyun |
| Native Name | 정재현 |
| Birthday | February 14, 1997 |
| Age | 28 years and 2 months old |
| Zodiac Sign | Aquarius |
| Birthplace | Seoul, South Korea |
| Height | 5’11” (180 cm) |
| Weight | 143.3 lbs (65 kg) |
| Blood Type | A |
| MBTI | ESTP |
| Education | Seoul School of Performing Arts |
| Languages | Korean, English |
| Group | NCT NCT U NCT 127 |
| Social Media | Instagram: [@_jeongjaehyun] |