Jaeyun

Jaeyun, under his name Alex Moon, joined his first idol reality survival show BOYS24 sometime in 2016 and was a member of their pre-debut boy group of the same name. He was a member of the show's Red Unit. By fan vote, he did not make it into the top ranks and was hence eliminated.

In 2017, he participarted in the reality survival show MIXNINE. He was eliminated in the episode 10 after ranking 50th place. On October 11, 2022, he was revealed as a member of the upcoming boy group 8TURN (then known as BOM).