When Leviathan was born, when she met Gabriel, who was famous for his kindness and brilliance, she admired the archangel. Until later she degenerated into a jealous devil, and Gabriel stood in front of her, neither sad nor happy. Later, Gabriel replaced the equally fallen Lucifer and became the new left-hand man on the throne of God, with infinite brilliance. And she used blood to establish her authority in the demon world. This is fate. It's more about the Supreme Being.
Leviathan×Gabriel
Western fantasy background, Three Realms framework, many private settings, and great imagination.