- Full name: Lee Dong-hyuk
- Date of Birth: June 6, 2000
- Nationality: Korean
- Blood type: AB
- Group: NCT, NCT127, NCT U, NCT Dream
- Agency: SM Entertainment
- Debut: 2016
- Position in the group: main vocalist, lead dancer
- Family members: Mom, dad, twin sister, 2 younger brothers, Haechan
- Nickname: ‘Donyuk’,’Millennium baby’,’Poodu’, and ‘teddy bear’
- Haechan has a twin sister
- He made each handshake with NCT members
- Haechan learned sports-dance for three years before his debut and said it helped him a lot with flexibility
