If anything Horus has been obsessed with Seth ever since he was kid. (weird... but ehem Egyptian mythology)
The part where Horus is shown going around his mother’s temple looking at Seth's hieroglyphics shows this.
I feel like Horus was so enamored by Seth that he was willing to take Seth's affection in any form, be it parental or whatever. Horus looked at him as Seth the guardian god. He idolized him. And I think Horus didn’t know how to place these emotions he suddenly started to feel at that time. He said it himself that he didn’t understand why he chose Seth over his mother, and technically the entire Egypt lol, despite the horrible things he’d done.
My conclusion is, Horus needs friends his age.
Y’all crying morality in the comments are so funny. Like... this manhwa was a red flag from the very first chapter. It’s literally built on inc.estious relationships so it’s so weird that y’all suddenly surprised that Horus is in love with his uncle who saw him grow up. What did y’all expect? Seth’s parents are siblings. His former wife is literally his biological sister!!his biological brother is obsessed with him!!! HOW YOU GUYS surprised that such things are even happening? The selective morality is so hypocritical. If y’all really cared about moral correctness, y’all wouldn’t touch this manhwa with a ten foot pole. Not defending any actions in this, but y’all just making me laugh.