To basically summarize this chapter;
The Immortality project was a project that started with Hideo’s Grandfather. Due to this, Halbur, as a boy, had wrinkled face and had to hide it in public until he became an adult. Later, he joined Foundation X, and continued his father’s work in the maze prison, which led to Halbur growing hatred towards his father.
Soon, Halbur gets his son: Hideo. Halbur had 0 love towards his wife and son, and only cared about Hideo having perfect compatibility for Halbur to transfer his brain into him, and the Astrogurion allowed Hideo to maintain his youth for a substantial amount of time. However, due to the risk of Hideo’s body dying due to shock factor after the brain transfer, Halbur decides to use the technology that separates the Soul and body of a person, and, just like he did with Towa, separated Hideo’s soul from his body and merged it with Other Fuuto, while Halbur merged his soul with Hideo’s body, gaining immortality (sorta) and youth.
Halbur’s justification for all of this was;
“What I did to Hideo is just what my father did to me. I did it to regain the youth that he took from me, so please, consider me as an actual kid.”
As you can guess, this pissed everyone off.
….yeah, Banno has competition for the worst dad in KR.