1
He uses lots of aegyo.
2
His stage name Haechan is broken down as Hae (해) means “Sun” while Chan (찬) means “full”. So his stage name means "Full Sun".
3
During NCT 2018' Spring Fan Party, when he was asked of things he likes, he answered "Mark Lee." Then when he was asked of things he didn't like, then too he answered "Mark Lee".
4
Members say he’s the member with the cutest personality.
5
He dreams to become a singer-songwriter.
6
He wants to change bodies with Johnny because of his height.
7
The song that made him want to become an artist is SHINee’s “Replay”.
8
He loves playing Overwatch with the other members. His main characters are Junkrat and Lucio.
9
He likes tasty food and NCTzen.
10
Haechan said the "Ah~~~~~" in Limitless in his sleep according to Mark and could hold it for a long time too.