- Both are part of the sub-units NCT DREAM.
- Both were SM Rookies.
- Both have blood type A.
- Both can play guitar.
- Both are fixed MC on one of Korean music shows. (Mark for MBC Music Core [2018-2019], Jeno for SBS The Show [2018-2019]).
- Mark was born in 1999 and Jeno was born in 2000.
- Mark is Canadian whereas Jeno is Korean.
- Mark's zodiac is Leo and Jeno's zodiac is Taurus.
- They are in the South Korean boy group NCT.
- Both attend School of Performing Arts (SOPA). (Formerly)
- They performed "Baby Don't Stop" by Taeyong & Ten in NCT Dream Show.
- They sometimes practicing rap together since they were trainees.
- They both wore glasses when they first met each other.
- Jeno said Mark is his bias from NCT Dream.
- Jeno chose Mark as one of the closest NCT members to him.
- Jeno chose Mark as someone who knows him the most among Dream members because Mark knows well when Jeno's mood changes and also Jeno's habit. (180907 NCT Night Night).
- Jeno chose Mark as the member in Dream he wants to do unit with. He said it would be fun to form a hip-hop unit with Mark as his solo activities. (Grazia Sept '17 Interview).
- Both chose each other as the most handsome member in NCT Dream.
- Mark and Jeno have a habit of holding each other's hand since they were trainees because both have the same hand size.
- Mark once gave a gundam to Jeno as his birthday present.
- Mark and Jeno have been emceeing together for three times: SM Rookies Show (Christmas Special), K-pop Festival in Tokyo 2018, & NCT Dream Show #1.
- In NCT Dream Show #2, Mark and Jeno performed a rap stage together.
- Jeno said once he gets driving license, he wanted to go driving to the beach and chose Mark as the member he wanted to go drive with.
- A fan asked Jeno if there is anyone who makes him happy just by looking at that person's face and he answered Mark. (180323 Fansign).
- Jeno chose Mark to be the person he wants to be roommates with because he hasn’t roomed with him since their trainee days. (PUFF NCT Dream Fan QnA Ep. 1).
- Mark wrote "Jeno confessed to me" as his TMI. (Czennies Would Like This Too [Dream] Ep. 3).
| To view the MarkNo gallery, click here.