Seungjoo (SAY MY NAME)
| Full Name | Yoon Seung Ju |
| Stage Name | Seungjoo |
| Native Name | 윤승주 |
| Birthday | September 24, 2010 |
| Age | 15 years old |
| Zodiac Sign | Libra |
| Height | 163 cm (5’4″) |
| Weight | N/A |
| Blood Type | A |
| MBTI Type | INFP |
| Birthplace | Hwaseong, Gyeonggi-do, South Korea |
| Nationality | Korean |
| Group | SAY MY NAME |
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