This is a show that you watch just to enjoy the actors and the cliché plots and scenes. It's not a drama that you need to fully invest emotionally and mentally and so don't worry too much about plot. I only came here to watch Zhang Zhehan and came to really enjoy Li Yitong's acting as well. I enjoyed their chemistry and their scenes and really liked their characters despite some small frustrations.

Some people don't like Ming Xia because he doesn't seem to do as much for Qing Cheng, but for a human man, he has a genuine and true heart toward her. I appreciate that. I did have second lead syndrome for a little while for Yalkun Merxat's You Tong, but that went away toward the end. I really adore Ming Xia and felt bad for him toward the end of this season since he was just a human after all and was manipulated to some extent.
Some people also didn't like Qing Cheng and are frustrated with her going back and forth--and I do think the story didn't need to do that as much--but it was understandable for me. Qing Cheng is not a badass (in this season). She's just a girl who's frightened of what she's becoming and fears for her loved ones. Yes, she was weak (physically--she wasn't a fighter and didn't know her powers yet)and too trusting, but that was her personality to believe in good and righteous. She was just trying to protect her loved ones but sadly that backfired in many ways. Thus, in season 2, the contrast is huge--she changes. I'll stop there with the season 2 spoilers.

The last probably 6-8 episodes did suffer in writing a lot and I ended up skipping the scenes to just get to the end to see what happened. There were several things that made me laugh because of its plot hole or ridiculous scenario--like when the villain human doctor survives a cliff fall but not the demon boy. It made me laugh ultimately so that was whatever. But definitely, toward the end, the writing became something like a middle-school fanfiction full of clichés and unnecessary angst/drama.

In the end, the acting especially from the two leads saved the show for me (along with a couple supporting characters who were interesting). I felt their emotions and sadness and even felt sad about their partings. I even liked the flashbacks to the older era (with Qing Cheng's parents). This drama has some strong cinematography, soundtracks, and directing, but alas, it suffers from poor writing. Ah, all that potential.

Edit after having seen most of season 2:
Oh yeah, season 1 is like an origins story for Qing Cheng lol and although I like the focus on the romance between Qing Cheng and Ming Xia a lot, I actually like season 2 more for various reasons that I'll write a review for.