Hyungseo (CLASS:y)
| Full Name | Myung Hyung Seo |
| Stage Name | Hyungseo |
| Native Name | 명형서 |
| Birthday | June 25, 2001 |
| Age | 24 years old |
| Zodiac Sign | Cancer |
| Height | 5’6″ (167 cm) |
| Blood Type | B |
| MBTI Type | ENFJ |
| Birthplace | Incheon, South Korea |
| Nationality | Korean |
| Group | CLASS:y |
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