- Dongark (Dong/hyuck and M/ark)
- MarkChan (Mark and Hae/Chan)
- Mark was born in Canada whereas Haechan was born in South Korea.
- Mark debuted first with the sub-unit NCT U in April of 2016, while Haechan debuted later on with NCT DREAM in August of 2016.
- Mark is in NCT U but Haechan is not.
- Mark was born in 1999 while Haechan was born in 2000.
- Mark is a Leo and Haechan is a Gemini.
- They are part of the South Korean boy group NCT .
- Both attend School of Performing Arts (SOPA). (Formerly)
- They used to not get along at all.
| To view the MarkHyuck gallery, click here.