Though CHILD is set to be released on February 4th 2022, I've already personally pondered on the possible themes in the song, which is reported to have been co-written by Mark. I've come to admire Mark's sense of introspection, especially when he talks about his roots or his growth (as an idol and as a person) in his lyrics. Hence the playing card design — a nod to the gamble that Mark took to exchange his childhood and youth in order to make a name for himself on the world stage. The chosen photos are also symmetrical contrasts of his origin (NCT U - The 7th Sense) and his present/future (NCT Lab - CHILD).