Chae-Yū Seong

Chae-Yū Seong is a liar and a sociopath who is willing to do anything necessary to avoid anyone discovering where he really came from. While he has never known what it is like to have a complete family, he truly loved his mother, a caring woman who played the harp in a famous orchestra before having him. After her passing when he was ten, Yū was left behind with her abusive husband, who saw him and his extremely poor health as a burden and began to take it out on him, often leaving Yū too injured to do anything but lay in bed on his laptop. During this time, Chae-Yū busied himself with a variety of things, including online schoolwork and language lessons, where he quickly discovered he was actually quite intelligent and learned a large variety of languages that he hoped to use to travel. He also taught himself how to code and became absorbed in all sorts of online forums, with his favourite being one for discussions on all things true crime. On this forum, he met a girl named Himari Nakamura, and they quickly became close online friends, constantly messaging each other on all sorts of social media about both true crime and everything going on in their personal lives.

When Yū was 16, his mother's husband discovered that he had made this friend and became angry at him for telling her so much of what he had done to Yū, culminating in him dislocating Yū's right leg, which caused a fracture in his hip, and destroying Yū's laptop, cutting off his only method of communication with the world, as he was not allowed to go outside. After six years of being abused and assaulted in every way imaginable, Yū decided he had finally had enough, fearing this man would kill him one day if he did not find a way to escape. That night, Yū slipped a sedative into the man's drink and left the house for the first time in years, despite the excruciating pain in his still-injured leg. After several days, he managed to find his way to a shipyard, where he stowed away on a cargo ship headed for Japan in hopes of finding a better life there. However, before it reached its destination, the ship sank in a storm, leaving Yū adrift on a life raft for two weeks before he was finally rescued by the Japanese Coast Guard and taken to a hospital in Japan.

Upon waking up again, Yū realised this was his chance to finally escape and claimed to not remember anything other than his name, his fluent Japanese making his lie much easier. After weeks of being in the hospital, he learned that the damage that had been done to his right leg by the abuse and him having to walk on it for so long was permanent, and Yū would never be able to walk properly again. He was also diagnosed with Ehlers-Danlos Syndrome. Even despite this, he decided one leg was a small price to pay for escaping his abusive home, and he was eventually adopted by the Ichikawa family. Thanks to his new family giving him a new phone and laptop, as well as a service dog that he named Haneul, he was able to reconnect with his friend, Himari, and learned that she had actually run away from her own home as well. After she told him the secrets behind what was going on at the Tokyo Academy for Forensics, he vowed to help her take it down, although before they could meet in person, an accident befell Himari, and she lost all her memories of who she was. Still, Yū had made her a promise, so he continued to use his computer skills to investigate the Academy and find a way to take it down, which eventually led to him being arrested for hacking into government websites, among other things. Instead of going to prison, however, he was invited to attend the Tokyo Academy for Forensics as a Forensic Computer Analyst, and accepted the offer, realising the Academy could actually offer him the comfortable life he had always wanted.

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