Summary:
The storyline is your typical Chinese, god, the weight of the world on your one decision story. The male lead is tasked with killing the female lead because he was told that she would bring chaos and destruction to the world, as a god he has to finish the task and remain neutral. However of course he falls in love with her and refuses to kill her.
**Spoilers**

They eventually find a middle ground where everything works out but it gets messed up because of the male lead father. The ending is very confusing. It's an open ending so if you don't like those then yea, not for you. From my understanding, the phoenix is reborn in the first life, and therefore the main lead couple's fate has changed because if the girl is still a phoenix then they are bound by fate to kill each other or cause war. So it's not the main lead falling for the phoenix, he's just falling for a regular mortal changing the course of both their fate.

Pace, acting, story:
It was fast-paced for me, think they rushed the ending and it wasn't an explained or a solved ending. The storyline had potential but when they added timetravel towards the end they messed it up, it was introduced too late and confused everything. I love the female lead, seen her in some other dramas, she did well as usual. As for the male lead, think this is the first time I've seen him, he did okay. Felt like there was no chemistry between these two, when they were together or you could say dating in the drama I found it awkward because I was like when did that happen other than the accidental falling and catching the female lead.

Overall the cast did great, loved the action scenes, just something to waste time or have in the background. If you're looking for full-on romance, chemistry, or action I think this isn't it. It has those things here and there but it's very simple.