Up on Olympus, there was an abundance of music spirits, many of which were creations of Harmonia, and Cameron was no exception. Created on April 15th of the year 1996, Cameron spent most of his years maturing up on Olympus. Unlike most spirits or nymphs, Harmonia created Cameron initially as an infant so that he could go through the whole growing process. Only a year after his creation, Harmonia decided she didn't want to be tasked with raising Cameron from infancy to adulthood, and instead of just robbing the childhood years she wanted him to experience by aging him up, she simply sent one of her adult music spirits to South Korea, Busan to be exact.
While in Busan, Cameron was left at the doorstep of the Jeom family. Ra-Yeol and Seung-Mi Jeom were a couple in their late twenties by the time Cameron arrived on their doorstep, and since their was a fake note describing how Cameron's "mother" couldn't take care of him, the couple took pity on the small child and decided to go through the process of adopting him. Cameron legally became Jeon Sung-Hyuk, and he was treated as though he was actually Ra-Yeol and Seung-Mi's biological son.
Growing up, Cameron was a very lovable kid, always doing as he was told and never asking questions. And when his baby sister Yoon-Ji was born three years after his creation, Cameron took amazingly good care of her. The two were extremely close, and whenever Yoon-Ji needed protection, Cameron would be there to help her. Yoon-Ji was always going against Cameron's wishes, and despite getting in spats here and there, there was no denying just how close they were.
Cameron didn't grow any sort of knowledge of his real existence until he was fully grown and would stop aging, this took place in roughly 2014 when he technically nineteen years old. Harmonia had figured it would be a good time to finally explain to him where he actually came from. Harmonia had intentionally bumped into him on the streets, and Cameron was taken back when Harmonia introduced herself as his creator. After conversing, Harmonia told Cameron everything he wanted to know about himself.
It wasn't until 2015 that Cameron took an interest in actually going to camp, however he didn't want to leave Yoon-Ji behind. Lucky enough for him, Artemis had taken an interest in Yoon-Ji and she became a huntress in late 2015 around November. After Yoon-Ji left to go with Artemis, Cameron decided he'd go to camp, not arriving until February 9th of 2016.