- Birth Name: Mark Yi En Tuan (마크이엔투안)
- Birthday: September 4, 1993
- Blood Type: A
- Education: Arcadia High School – 10th-grade certificate
- Favorite Artists: Chris Brown, Drake, ASAP Rocky, Tyga
- Favorite Food: Hamburger, Meat
- Height: 175 cm (5’9″)
- Hobbies: Skateboarding and snowboarding
- Instagram: @mark_tuan
- Korean Name: Dong Yi Eun (동의은)
- Nationality: American (but of Taiwanese descent)
- Position: Main Rapper, Lead Dancer, Vocalist, Visual
- Specialty: Martial arts tricking
- Stage Name: Mark (마크)
- Twitter: @mtuan93
- Weight: 59 kg (130 lbs)
- Zodiac sign: Virgo
aug 17 2017 ∞
aug 17 2017 +
aug 17 2017 +