There is something about the supernatural that always piqued Karl's interest. As he child he found all things strange fascinating, and set out to find reasoning for them. You'd think during his childhood his wild imagination would be subdued, but his parents' efforts were useless. As he grew, he only became more infatuated with mysterious, which ultimately drove him to become an investigator.
Late at night, Karl happened to be investigating a case when a woman he had never really seen, knocked on his office door. The woman was breathtaking, with dark hair tumbling down her shoulders, matching her brown eyes, and gray dress. He tried to ask her how she got in, but she got straight to the chase and explained the case she wanted him to work on.
Apparently, a friend of her's daughter has gone missing, and she needed help finding her. Karl who had every reason to say no and demand that she get out of his office, accepted the case and began working on it immediately while the woman was still with him. Around three am the woman left after telling him everything she knew. She wished him luck and told him her name was Hailey and how to contact her when he figured it out.
Although his body desperately need sleep, Karl took all the documents he had printed out, and the info the two had collected together and took it home with him so he could continue studying. Two hours later, he was snoring his head off on his desk as he finally let sleep overcome him. With help from Morpheus, Hecate was able to enter his dreams as Hailey, and explained the future events that were to happen to him depending on the choice he made.
First, she began with what would've happened if he had chosen to reject the case, and then vaguely explained that good things will now happen to him because of the choice he made. At the end of the dream, Hailey bursts into flame, flying off into the darkest edges of his conscious as an owl. Karl awoke in the early afternoon, and decided to report that he'd be staying home today because he wasn't feeling well.
Over the couple few of weeks, Karl worked his hardest to figure out the case, keeping in mind his dream. His belief in the supernatural not only fueled his persistence on this case, but his dream where Hailey visited him. By the end of the month, he had solved the case and the kidnapper of Hailey's friend's daughter was arrested a couple days later.
In thanks for his help, Hailey took Karl on a date that overall went well. The two began dating for a few months and then later broke up, but not before Karl had impregnated Hailey on a particularly intoxicating night. A few days later, Hailey appeared yet in another one of Karl's dreams and explained everything. She told him she was a Greek goddess named Hecate, and that in a couple of months she would bare a child who would have the powers of an immortal but the life span of a human—if they managed to survive that long. She told him he needed to bring her to a camp on the coast of Long Island called Camp Half-Blood when she shows signs of being attacked by monsters.
Karl, with his strong belief in the supernatural, did not waver and promised to accept the child when she got here. Like Hecate promised, several months later, Karl came home to a basket at his front door. He smiled nostalgically, picked the basket up, and took it inside. She kept her promise.
At the bottom of the basket, under the infant swaddled in blankets was a pack of hairbands and a note. Having planned ahead of time, Karl set the baby in her crib and sat down besides it with the basket. He read the note, which stated, May I ask how you are doing Karl? I'm doing fine, yet wandering the world sometimes gets a little boring. These hairbands transform into throwing axes when you snap them. You know—when the time is right—take the girl to Camp. Teach her how to use these by the way, we wouldn't want any accidents. He put down the note and inspected the hair bands. I should keep these in my safe, he decided and rose to do just that.
Karl named the girl Hana, and gave her the middle name Ji-yeon, which would be her Korean name. Years passed, and Hana was a wonderful, bright little girl that Karl would never wish to replace. Having someone else besides him in the house was delightful, and better yet Hana was a reminder of Hecate's love. But there was always the threat of monster attacks on his mine, so by the time Hana was 8, Karl had already told and began teaching her about the throwing axes.
Another quality of Hana, she's a fast learner. In under a year, she had absorbed the knowledge of her weapons and knew how to use them to defend herself and go offensive on an enemy. Just for good measure, Karl also had her learn Taekwondo. "The kicks will come in handy," he had promised her. And in deed they did.
When Hana turned 10, a pair of harpies picked up on her scent and attacked her while she was walking to the park. Taken by surprise the harpies were able to land a few cuts on her before she returned the favor. Hana dashed out of the way of another incoming attack and removed her hairband from her wrist. She quickly snapped it and threw it at one of the harpies. The harpy—who just saw a regular hand band—wasn't expecting it to transform into a throwing ax at the last second, and it caught her right in the face. In result, the harpy turned to dust and the ax fell to the ground.
Hana retrieved her ax, and when she turned around, the other harpy dived down to avenge it's partner. This time, she was more then ready, and like a baseball player, she swung her ax at the enemy and cleanly cut it's head off. The separated corpse turned to dust. She took some time to slow her breathing and then decided she should go home and tell her father.
She ran her fingers along the side of her ax, and it transformed back into a bracelet that she put on. Then she headed on home, running all the way.
Her father who expected this based off of Hecate's warning that he still remember to this day, decided to take her to Camp. Hana had no motive to move, and was quite upset when he suggested this. Due to her request, they stayed in Sacramento for four more years before Karl said enough. Over those four years, the monster attacks had progressed and Karl became more wary until he finally couldn't stand the idea of his daughter getting hurt.
He bought airplane tickets to New York and called a moving agency to move all their things to their new home there while they flew. Hana threw many fits—she didn't want to departure from everything she's ever known—but finally agreed. They set off, and at the airport they met a boy named Addysin Myung who was also trying to get to New York and find Camp Half-Blood.
Hana was a bit skeptical of the boy, but he didn't have a malicious air around him so she put her suspicion to the side. Besides, he was cute, and she was sure he'd seen him modeling somewhere in a couple magazines. Could've been someone else, but she found that hard to believe.
After hours of waiting, they finally took off and later landed in Chicago where they met an orphaned girl named Olive. While on their way to the mall, the taxi driver turned out to be a Scythian Dracnae and attacked them. Hana, with Addysin's help, defeated the monster. She later discovered Olive had ran away with almost all the cash in her father's wallet. Angry with the outcome, she stayed silent with rage for the rest of the drive back to the airport and the flight to New York.
When they arrived at Karl's new apartment in New York City, Karl invited Addysin to live with them until they could find camp, and the boy agreed. The apartment had enough bedrooms for the three of them so it was a comfy fit. After a week or two, the moving truck came around, and they could finally retire from sleepy bags into comfy beds. Later that week everything was set in order, and the last thing to do was enroll them into school. Hana insisted that they be home-schooled, and Addysin supported her, so Karl agreed.
After searching the state of New York for a year, they finally found Camp Half-Blood with the help of a saytr. Immediately after stepping past the borderline of Camp, Hana has been claimed by Hecate.