For the first 15-20 episodes you will actually like the Bai Ju, he was somewhat a decent guy. He ensured that Shang Gu got a second chance at life, treated her like a loved one for first half of that second life. Then he disappears for 10,000 years. Yes, the time just randomly speeds up in this show. He splits into two bodies, the good part of him, Qing Mu wins over Hou Chi, the reincarnation of Shang Gu., treats Hou Chi like a goddess that she is. The part of him that was Bai Ju eventually takes over and then treats Hou Chi and their child like shit. "Worst Father Award"

I wanted to stop watching when Qing Mu was taken over by Bai Ju. The last thing the guy said to Bai Ju was "Be nice to Hou Chi" Guess what Bai Ju did? He was cruel, because he wanted to sacrifice himself.
The episodes from then on were just unbearable to watch and there is none of the Bai Ju loved in the first half left.
He begins by denying that he was ever Qing Mu to Hou Chi, who at the time was pregnant with their child.
He then decides to marry the woman he promised he would never looked at because Hou Chi/Shang Gu was the only one for him. He decides to trust that woman more than he ever trusted Hou Chi.
On the day of his marriage, when she confronts him (since they are still married), he divorces her in front of everyone. Not only that, allows her to get physically hurt, lets her father die in front of her, because it would have spoiled his grand plan of sacrificing himself.
He then neglects his child, while doing god knows what while the woman he claims to sacrifice his life for is in coma and now their child is being raised by the uncle (Tian Qi) who would actually have made a better partner for Shang Gu.
But does he cut off the connection completely? No, he tries to steal undeserved moments with them. Just let them go my dude! It was painful to watch.

The worst part of these sacrifices is the lack of trust, but i usually give it a pass because that's how these stories are structured, what I cannot get over is treating your partner cruelly.

Hou Chi died a sad death, betrayed by Bai Ju in all forms.

Edit: I forgot to mention a few things in the review before.

I was so upset for Hou Chi, that I forgot to talk about the environment they created for that child with the kind of choices they made.
Shang Gu once she woke up from her slumber was a good mother for a minute and then she had to go kneel in front of the deity for 500 years so they could have Bai Ju back. So, another 500 years of neglect for the child.
Sure, we can assume everything was hunky-dory once Bai Ju got back, but let's not lie and say they were both good parents for their child's first years of life.

The best part about this drama was the actors, they did such a good job in keeping my interest even though I wanted to give up. I did like the characters, they were pretty complex and not one-dimensional. I just feel sad for the child, makes me even wary of watching "The Last Immortal" but I need a few days to recover from this heartbreak and watch something light before even thinking of watching that.

I also held on till the ending because I wanted all that pain they suffered to lead somewhere and was glad to see that they did have the happy ending most people wanted.