The ending was good...better than I expected.
My only complaint is that the female lead was not upto par with the male lead when it comes to sensitivity. And the male lead wasn't that bad at all. After all, the humans made him that way 1000 yrs ago. The female lead should've understood that & forgiven the male lead 1000 yrs back itself. From what I see, she was one of the main source of all complications & messed up fate of the main male lead. The male lead had too much faith in her for his own good. Such a pity. But the ending made up for what was lacking in the their initial backstory & the plot as a whole --- somewhat.

The backstory of the main leads 1000 yrs ago ( minus the sidekicks) had huge potential. Such a pity all of that got erased by a poorly designed plot.
The story could've been made thousand times better and rosier--- not moodier!

Hope there will be a season 2 with a more epic but simpler, rosier story revolving around the male lead and the same, but wiser, more sensible female lead with no unnecessary side stories and convoluted complications. Only then, will I as a viewer be completely satisfied.