He uses lots of aegyo.
He dreams to become a singer-songwriter.
Members say he’s the member with the cutest personality.
His stage name Haechan is broken down as Hae (해) means “Sun” while Chan (찬) means “full”. So his stage name means "Full Sun".
He loves playing Overwatch with the other members. His main characters are Junkrat and Lucio.
He wants to change bodies with Johnny because of his height.
The song that made him want to become an artist is SHINee’s “Replay”.
Haechan said the "Ah~~~~~" in Limitless in his sleep according to Mark and could hold it for a long time too.
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".
He likes tasty food and NCTzen.