| Full Name | Kim Myung-jun |
| Stage Name | MJ |
| Native Name | 김명준 |
| Birthday | March 5, 1994 |
| Age | 31 years and 1 month old |
| Zodiac Sign | Pisces |
| Birthplace | Suwon City, Gyeonggi Province, South Korea |
| Height | 5’9″ (175 cm) |
| Weight | 132.3 lbs (60 kg) |
| Blood Type | O |
| MBTI | ENFP |
| Education | Global Cyber University |
| Languages | Korean, English, Japanese |
| Group | ASTRO |
| Social Media | Instagram: [@mj_7.7.7] TikTok: [@astro_mj777] |