- Full name: Kim Dong Hyun
- Date of Birth: September 17, 1998
- Nationality: Korean
- Blood type: O
- Group: AB6IX
- Agency: Brand New Music
- Debut: May 2019
- Position in the group: sub vocalist
- Family members: Mom, dad, older brother, older sister, twin brother, Kim Dong Hyun
- Nickname: ‘duck’, ‘hongmeogeonmeo’,’honggun’, and ‘dongdongyi’
- He participated in a boy group survival program, ‘Produce 101 2’ but didn’t make it to the finals
