Kohaku was born to a Japanese father by the name of Akira Mochizuki and a Korean mother Young-soo in Seoul, South Korea. His family life wasn't always easily. Mostly when he had been at home his family had never cared about him. When he was growing up his parents had hated him and wanted him out of the house as soon as possible. For any case that he had known that his parents weren't going to love him at all, to them he was a liability. For him, he had never had thought he was going anywhere in school.

He had been living through his life without any direction. Kohaku had never thought that he was going get any better in his life. During his time in high school he had gotten into hacking computers. Kohaku had an infatuation with hacking computers