Only on episode 5, if the next half is a typical Netflix flop then I'll edit. But this shows really good! A Korean style of story telling has some sort of hybrid between Japanese and western story telling which makes it best of both worlds, so I'm relatively new to its style, it's worth a watch if you like soft horrors/thriller with hints of drama.
Focusing on an apocalypse and the human condition of being alive and what that should mean. The concept of desire and reason being the focus.
Edit: Having finished the season, very good. The twists and turns are a little rushed at the end but they're none the less, very interesting and leave room for interpretation.
Is it worth the watch? I'd say so, you're own millage will vary, because as I mentioned the format is very different from Western writting.