| Birth Name | Oh Si On (오시온) |
| Stage Name | Sion (시온) |
| Birthday | May 11, 2002 |
| Nationality | Korean |
| Height | 178.9 cm |
| Weight | 57.5 kg |
| Blood Type | O |
| MBTI | INTJ-A |
| Group | NCT |
| Company | SM Entertainment |
| Position | Leader, Lead Vocalist * |
| Zodiac Sign | Taurus |
| Representative Emoji | 🌷 |