@haejin just got a downvote wave

one of my followers @haejin and to whom I follow regularly for his precision in his post has just received a wave of downvotes in this post:

https://steemit.com/bitcoin/@haejin/mana-from-heaven

Obviously it is something premeditated. I wonder the reason.

You can check yourself the wave scrolling his: https://steemworld.org/@haejin

None of those who did downvote have written the reasons in the post of @haejin

Does anyone know?