In January 1989, Cheon Kyung-Hee was struggling to make ends meet with all of her bills. Hoping to drink her sorrows away, she went to the local bar in order to forget about her problems. While at the bar, she met a man that introduced himself as Lee Sang-Chul. Eventually the two had spent the night together, and the next morning, Sang-Chul had left with no official goodbye. Just a simple letter, if you call a letter explaining one's godly status as simple. The letter had explained that the man she thought was Sang-Chul, was actually the Greek god Dionysus.
A month after Kyung-Hee's encounter with Dionysus, she had discovered that she had become pregnant. After a few months of pregnancy, Kyung-Hee went to the hospital, where she was given the information that she would be having twins, one boy and one girl. Once Kyung-Hee gave birth to her children, she named the boy Young-Jin and the girl Mi-Young. However, it was later revealed that both children's brains weren't developing properly. Young-Jin was eventually able to survive, and the part of his brain that wasn't developing correctly fixed itself. But Mi-Young wasn't as lucky, she started to have strokes, and eventually she had died after a month of being born.
Kyung-Hee didn't really care much for Young-Jin, she often just gave him the essentials he would need, and never gave him any form of compassion whatsoever. Due to this, Young-Jin led a very quiet and obedient life. He never really talked to anyone during school, only speaking when asked a question.
On Young-Jin's twelfth birthday, he was walking home from school when he heard a big bang come from inside his house. He immediately hurried inside the house and much to his alarm, saw a giant Cyclops with Kyung-Hee in it's hands. Seeing his lifeless mother, Young-Jin quickly broke down, he immediately tried to defend himself without thinking, but to no avail as he was quickly smacked across the head with a club. With a hazy vision, he could see a goat legged creature slaying the beast that had killed his mother, and tried to kill him.
With Young-Jin's mother now deceased, he awoke to the same goat legged creature that saved him tending to his now bruised temple. Once he was stable enough to walk, Young-Jin went into his room to pack his things for a plane ride to New York. After packing some clothes, Young-Jin went into his mother's room to get money, and when he did he found a note and a picture of Young-Jin's twin sister. It explained everything about Mi-Young and how she died. Amazed that his mother hid Mi-Young from him, Young-Jin left through the back door without informing the satyr that saved him.
After purchasing a ticket to New York where his mother's brother resided, Young-Jin later arrived in New York and was adopted by his uncle Ken Cheon. He then took on the name of Cody. As Cody grew up with Ken, he received way more love than he had ever received from his mom. Cody opened up to Ken, and more people. With Ken being a child of Pandia, he knew that Cody was a demigod after he told him about how his mom died. Ken began training Cody, teaching him how to defend himself and kill monsters. Whenever a monster came to attack Cody, he found it easy to kill them due to his excessive training.
After Cody's fourteenth birthday, Ken sent him to Camp Half-Blood for further training. Cody had spent three years at Camp Half-Blood until he met a girl by the name of Jenny Park. Cody was instantly in love with Jenny, and when they both turned nineteen Jenny found out she was pregnant with Cody's baby. Figuring Camp Half-Blood wouldn't be a good spot to raise a child, Cody and Jenny moved into an apartment together. Two weeks after Jenny gave birth to a baby boy who they named Matteo, Jenny had gotten into a car accident where she died moments later.
Now being a single father, Cody took great care of Matteo. But after a month of Matteo being born, he was diagnosed with the same brain problem that Cody had when he was younger, as well as Mi-Young. But unlike Cody, Matteo seemed to have the same fate that Mi-Young had. With Matteo dying in Cody's arms, he took him to Ken and begged him to help. Ken then brought Cody to Olympus where they pleaded to Zeus to save Matteo. Zeus agreed to saving Matteo and turning him into a Storm Spirit, in exchange for Cody's freedom. Cody took Zeus' offer, and became an immortal servant to Zeus.
Zeus also accelerated Matteo's aging, so in six years if he ever wanted, Cody could go back to Camp Half-Blood alongside Matteo. Matteo aged seventeen years in only three years, and since nymphs stop aging once they are fully grown, Matteo seemed to have stayed at seventeen. By that time around, Cody got tired of feeding Zeus with grapes and cleaning up his bed when he and Hera had nightly sessions. Hebe, who sympathizes him because of her similar jobs, holds a feast in Mt. Olympus. In the midst of the party, the goddess sneaks the two away into the Empire State Building elevator, granting them freedom.
However, as they emerge into the mortal world atop the building, a gang of vicious storm spirits whisked away Matteo into places who-knows-where. Seeing that Aeolus was responsible for the storm spirits' activities, he went for Aeolia to meet him. However, when he arrived there, he was just in time to see his son and the other spirits being released again by a wind nymph. With no idea on their destination, he seeks the help of his uncle Ken to find Matteo.
A week had passed before Ken found out that a freak storm has been battering the area around the island of Ogygia for several days already. With no time to spare, they traveled there, only to find more trouble other than separating Matteo from the violent spirits. You see, Calypso's latest lover, a child of Hebe, has been struck by lightning while trying to seek shelter in Ogygia. Completely pissed off, Calypso wouldn't allow Cody, Ken, nor Matteo to leave her island lest someone stays with her to replace her dead lover. In the end, Ken volunteered, leaving the father and his son to board the goddess' magical raft.
As they traveled for Camp Half-Blood, Hebe found out what Matteo and the other storm spirits did to her son. As such, she cursed Matteo by reverting his mind into that of a five-year old. Shortly after they arrived, Cody found a place for them to live in at the Nymph Sanctuary while still adjusting to his son's new behavior.