Jeong Da-Hyeon was new to living in Vancouver, British Columbia. After moving there on June 27th of the year 1999, he had settled into a home with his cousins. The night Da-Hyeon arrived in Vancouver, his cousins decided to take him out to explore the town. However things went array when they went to a nightclub and Da-Hyeon ended up drunk and going home in a taxi by himself while his cousins stayed behind at the club. When Da-Hyeon was in the taxi, a young lady who was roughly his age joined him in the taxi and asked to get off on the same street as Da-Hyeon.
After riding in the taxi together, they had gotten to know each other as much as two people could when they're in the back of a taxi drunk. When they eventually got out of the taxi, the woman invited Da-Hyeon to spend the night at her place, which he accepted. However after more drinks were brought out, the two ended up in bed together and Da-Hyeon woke up in an empty bed with no recollection of what had happened the night before. In a hungover state, Da-Hyeon stumbled home early in the morning and went right back to bed. Four days had passed, and after someone rang the doorbell, Da-Hyeon discovered a baby in a stroller. There was a letter on it, explaining to him that the baby was his and what the baby really was.
After wrapping his mind around the fact that he now had a baby, Da-Hyeon decided to name the child Byeong-Heon. However the idea of a family didn't last long for Da-Hyeon, as during the first night of Byeong-Heon's arrival, Da-Hyeon had no sleep do to his son's constant crying. Being young himself at the age of twenty two, Da-Hyeon decided it'd be best if he gave Byeong-Heon up for adoption. Within a few weeks, Byeong-Heon had gotten adopted by a couple named Kim and Leonard Geun who also lived in Vancouver. After taking him home to live with them, the couple legally changed his name to Cory Byeongheon Geun.
At first Cory's life was good. Kim and Leonard both had jobs with a high income at the same law firm and Cory was treated well. However that changed when the firm went out of business when Cory had just turned seven and the couple had to think of different ways to bring in money. At first they started off selling drugs, but when they eventually got addicted to what they were selling, the couple turned to something far worse. When a well known sex offender who was on the run asked Leonard and Kim if he could pay them to have sex with Cory, the two (who happened to be stoned at the time) agreed for a price of one hundred dollars.
Late in the night when Cory was fast asleep, the man came and raped Cory in his sleep, the worst part being that during the session Cory had woken up and his screams and cries for help were ignored by his drunken and high parents. When Kim and Leonard realized how easy it would be to make money doing this, they continued taking money from creepy old men who would come into their house and rape Cory in his sleep, more times than not he woke up during it as well. This continued on from the ages of seven to twelve, but after that Kim and Leonard "expanded" their business and began to drive Cory to their clients houses against his will.
By the time Cory was thirteen, he had been raped by more than roughly thirty different men. And it was during one of these times were Cory had his first monster attack, one of the clients that Leonard had drugged Cory and dragged him out to the client's house just so happened to be a cyclops who had discovered Cory's demigod status and with the neglectful attitude of his parents he saw the perfect opportunity to kill Cory. However, Cory was luckily able to escape after screaming out in distress and a neighbouring adult demigod came to his rescue and saved him. Before the cyclops was killed, Cory ran away and didn't stop running until he was at the police station.
At the police station, Cory told them everything his parents had done, and later that night they were both arrested for forcing Cory into child prostitution. It wasn't until the next day that the police had gotten in touch with Cory's biological father, who now went by the name of Felix Jeong. Felix was happy to finally be reunited with his dad, and Cory for once felt safe.
For the next two years, Cory lived with Felix. But it was after Felix regaining his guardianship over Cory that he immediately felt like he had hit rock bottom. As great of a dad as Felix was to Cory, he never knew how to help Cory get through everything he was dealing with, and with his depression combined with the constant fear of being raped again as well as monster attacks that always seemed to occur (most of which he was saved by a demigod or satyr passing by), Cory never seemed like he was ready to talk to anyone about what he was dealing with.
Monster attacks happened almost every six months until Cory had turned sixteen. It was during his final monster attack that Felix was advised by the satyr who saved him this time that Cory would be much safer at Camp Half-Blood. After leaving the only parental figure that was ever good to him, Cory was left alone at Camp Half-Blood, where he was claimed by Themis.