Siyoon (Billlie)
| Full Name | Kim Si Yoon |
| Stage Name | Siyoon |
| Native Name | 김시윤 |
| Birthday | February 16, 2005 |
| Age | 20 years old |
| Zodiac Sign | Aquarius |
| Height | 5’5″ (165 cm) |
| Blood Type | N/A |
| MBTI Type | ISFP |
| Birthplace | N/A |
| Nationality | Korean |
| Group | Billlie |
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