Where do I start.

First of all, I never write reviews. But this was so bad, I had to warn people.

I do not know if this was supposed to be part of the plan, but the characters of this drama are borderline emotionless and completely shallow.
People dissaper, die and no one bats an eye. Apart from an older couple that appears for literally 5 minutes and shows emotion, everyone else is almost constantly expressionless. There is absolutely no chemistry between the leading couple and there's barely any with the second leads.

The plot is all over the place. People come and go, side plots everywhere, videogame-like power-ups that happen for no reason whatsoever, "magical artefacts" that appear just when you need them (with utterly ridiculous names such as "profound terminator bomb") and a very boring beginning. It took me until episode 20 to feel remotely "invested" in this drama.

The effects are not the best, but not the worst. The editor of the cut-scenes needs to get fired. They cut from one scene to another without any reason or explanation of what has happened at all.
The music score was to my taste.

Overall, if I was not completely bored and out of dramas to watch, I would've dropped it in an instant.
I did originally, watched another two cdramas in between and then I returned to give it another chance.
I shouldn't.