Poorly plotted, badly edited story about obsession and desire in a world with demons and immortals.
The characters for the most part are hard to like, and harder to empathise with, and as time goes on, this only gets worse. Character progression is generally backwards. People start out apparently "decent" & "upstanding" but almost never stay that way. Most where never that way in the first place. Main characters are full of flaws, and don't deserve the ending they are given.
ChongZi never really works hard, or fights for anything, except to indulge in her obsessive need to be close to YinFan. YinFan fails spectaculary to do anything meaningful when it comes to protecting CZ. They both trust in the wrong people repeatedly and are generally incompetent.

The Immortal sects are simply gullible bullies and no better than the Demon sects, even in their choice of targets, as they seem quite happy to beat on humans with the right incentive or guise or "righeousneous". The Demon sect is overpowered and Wang Yue ...is far too much.
The story takes too long to go nowhere. Many things happen for reasons of plot, not for internal consistency or logic and it all ends in a massively underwhelming whimper of a wrap up.

Technically its a happy ending...However none of the characters get the ending they deserve with the exception of Qin Ke who deserves to live a life free of *ever* knowing someone like ChongZi ever existed. The two mains certainly don't. They only reinforce the idea that being insufferably selfish and obsessive will grant you your wish. Even if the world was nearly destroyed because of it.