A Thousand Years

When Al Haitham almost died everyone finds out he's the reincarnation of king Deshret. Who's back to stop a unknown danger that could destroy sumeru and all of teyvat.

And finds out that not only he was reincarnated so was his love the goddess of flowers who is now kaveh who has no clue what power he possesses.

What if the threat the king Deshret has to stop is closer than he thinks?