| Full Name | Jang Eunseong |
| Stage Name | Dosie |
| Native Name | 장은성 |
| Birthday | February 11, 2000 |
| Age | 25 years and 5 months old |
| Zodiac Sign | Aquarius |
| Birthplace | Busan, South Korea |
| Height | 5’4″ (163 cm) |
| Weight | – |
| Blood Type | – |
| MBTI | INTJ |
| Education | Hanlim Multi Arts |
| Languages | Korean, English |
| Group | PURPLE KISS (2018-present) |
| Social Media | Instagram: [@intheatresthissummer] |