He loved Leo, but the family fight made him lose Leo. Leo hated him. He knew it and had always known it, so he didn't hate Leo's revenge or for destroying the entire Oulant family. But when he was about to hurt his only relative, Noah did not hesitate to destroy himself to eliminate Leo's hatred.
Did he think that disfigurement would eliminate the hatred in his heart? Did he think he could live his life like an ordinary person? Leo has been in hell since his betrayal, and he has always been there waiting for him! He wanted Noah to live a hellish life like him every day, but... Why was his heart still beating? Wasn't it already dead?