Ok i read this in a few hours but im honestly getting whiplash at yanu's sudden change of ...

in the novel it's a gradual change after they fight. Yang suspects it early then dismissed it. The biggest thing is Yanu is capable of feeling emotions. That's when he realizes that Eyra might just be the mate he's looking for. It's also why he asks the question about where he was... or am I thinking too far ahead. I read the novel lol

They cut about 60 chapters of the novel tbh, all the other characters have development, some straight up got taken out. It's not a good adaptation at all

So what exactly were the signs that he believed Eyra is his mate? He did say the energy came from the North so it couldn't be him (yet in this dialogue, the whole exchange has Eyra's birth playing out in the background so the author is implying Eyra is his mate??)

I mean, I get longing after eyra after they had a big fight, but I dont think it's been explained why he thinks he's his mate now?

The thing is as I said biggest clue was him feeling things. When Eyra was young he actually did sense him. It's also what caused his parents death. Later it's revealed that they labyrinth has a spell that makes it so it can't be tracked North is south east is west etc... So he could never sense Eyra and it always pointed in the wrong direction hence him never knowing where Eyra is/was. That is a bit later or somewhere it's been a few months since I read the novel(reread). and as Titti said they cut out a lot of what happens in the novel. This scene he's supposed to gift him a bouquet of monster eyes but instead he just gifts him his eye etc...

He actually starts thinking it when he finds out he's the lord and confirms it when they're apart if I remember correctly, but it takes at least 10 chapters if not 20