Sei
| Stage Name | Sei |
| Full Name | Lee Seo Jeong |
| Country of Birth | Korea |
| Date of Birth | Jan 07, 2000 |
| Age | 23 years old |
| Height | 1.63 m (5'4") |
| Weight | 48 kg (107 lbs) |
| Blood Type | B |
Not Ranked
| Stage Name | Sei |
| Full Name | Lee Seo Jeong |
| Country of Birth | Korea |
| Date of Birth | Jan 07, 2000 |
| Age | 23 years old |
| Height | 1.63 m (5'4") |
| Weight | 48 kg (107 lbs) |
| Blood Type | B |
Not Ranked