Excellent, it is just the best Chinese animation I've ever seen, a really powerful competition for Animes and Cartoons for it's really well made and seems to have had the story planned really well.
The story may seem difficult to understand on the first episode, but as each episode rolled I got all the pieces together.
The suspense is good and not tedious, the emotions are very realistic to the point it brought me both smiles of hope and lots of tears. The story is very interesting to the point I binge watched it after the second episode. The best thing are the plot twists, this story is not predictable at all, whenever you expect something to happen (or not happen), something else goes on, and that unpredictability is what sets it apart from everything else out there. Sound Track (OP, ED and all the others in the episodes) perfectly fits the heavy mood of this world, and the Art style is really Unique. I guess you really can't judge an animation by its country of origin.
After the last episode ended in a cliffhanger plus an announcement of a second season, I just got hooked waiting for season 2. They better make a season 2 or my anxiety problems will get worse.
Excellent is the best word to describe it, though I just wish the characters' can get happier endings and not so much tragic ones. But you can't make something good and unique if you add only happy endings like in every other animation, so I guess that'll be present in the next season too...