The New Zealand native has played Archie Andrews on the show since its beginning in 2017 and was cast when he was just 19 years old.
But now KJ has admitted the success of the show sometimes makes him feel limited in the role, saying there are "so many restrictions on what I can and can't do."
"I felt so free coming from a show where I feel like I'm in jail a lot of the time," he told Demi Moore. "With this character, it was like, 'Wow, this is what it’s like to really express myself in a natural way.' I wasn't covered in makeup or hair products. I had long hair and a beard. I just felt free."