As you might have read in the plot summary, it seems to be an interesting story. But, it is not even close to that, ans I actually don't even know what I have watched. I've seen this drama months ago, and I cal still remember clearly how bad it is.

But let's start with the good stuff:
Im Joo Hwan character (the villain): his acting was on point. He showed everything the character was feeling, and I really cried at the end when he imagines his life going the right way.
The soundtrack: the show has some good music, and all the scenes get better because of it.

Now, the bad:
Everything else! The inicial idea of the story is nice. However, the execution was bad, so very bad. The story goes nowhere ans it is so repetitive. The same thing happens again and again. The leads are dumb and the villain plays with them all the time. The first episodes are good, but then it drags until the end.
I've never liked Ok Taec Yeon that much, and now I can't see him without just hating looking at his face. Poor guy... he's a great person (or it seems), but I can't stand his acting and expressions. The female lead is equally bad, although I've seen her in The Package and she was okay there.
The romantic scenes in Towards Zero are emotionless. I can see how the male lead fell in love with the FL, but not the other way around. The ML doesn't have a personality besides having the power of seeing how people will die. I can't fell the love between them, and maybe that's why, for the first time ever, I could't watch most of the romantic senes. It felt so out of place and forced.
Other aspects are just okay or not even worth mentioning.

In the end, I was just glad I finished this and didn't drop it, don't ask me how. It was good seeing Im Joo Hwan and getting emotional with the soundtrack, and I quite liked the final minutes of the show. It wasn't all bad, but rewatch value is zero.