Mark (마크) is a Korean-Canadian singer under SM Entertainment. He is a member of the Korean pop boy group NCT and its sub-units NCT U, NCT 127 and NCT DREAM. He is formerly a member of the pre-debut team SM Rookies.
- Stage Name: Mark (마크)
- Birth Name: Mark Lee (마크이)
- Korean Name: Lee Min Hyung (이민형)
- Birthdate: August 2, 1999
- Birthplace: Vancouver, Canada
- Height: 175cm
- Weight: 56kg
- Blood Type: A
- Specialty: Rap and Guitar
- Eonju Middle School (Graduated)
- School of Performing Arts Seoul (SOPA) (Current)
- [2016.10.26] Henry - The Man Living in Our House OST Part 2 (#1 니 맘에 들어갈래; I Want to Enter Your Heart (Feat. Mark of NCT))
-  EXO 90:2014
-  The Mickey Mouse Club
-  M Countdown (Special MC)
- Mark was accepted to SM Entertainment in 2012 with SM Global Audition system in Vancouver, Canada.
- His favorite sunbaenim is Xiu Min of EXO.
- He has been a trainee for more than 3 years.
- He doesn't like seafoods.