| Full Name | Oh Si-on |
| Stage Name | Sion |
| Native Name | 오시온 |
| Birthday | May 11, 2002 |
| Age | 22 years and 11 months old |
| Zodiac Sign | Taurus |
| Birthplace | Ogam-dong, Mokpo, Jeollanam-do South Korea |
| Height | 5’11” (179 cm) |
| Weight | – |
| Blood Type | – |
| MBTI | INTJ-A |
| Education | Mokpo Maria High School |
| Languages | Korean |
| Group | NCT NCT WISH |
| Social Media | – |