I really liked the concept of the whole tree story but the explanation was just utterly rushed and put as a "lil sidenote"; i mean it could have been more focused on the tree story, since this is where all the evil lies ... and then, not bothering to explain it more than just a tiny side note is just ...wow

Additionally, the pairing was wonderful and sort of suspenseful and I really liked it, but despite the previous relationship potential of the main pairing and the side pairings, it just sucked. The ending was a horror and content worth episodes packed into 1 teeny tiny last episode.
Seriously it would have been better I stopped watching midway 15...

Could have been a really really interesting story but was not produces as such one

Still it is watchworthy... just not the end