I wasn't wowed by the first episode of this drama, nor entirely enchanted by the second. But by the end of the second episode I thought... dang, okay, fine, I guess I want to keep watching. And I'm glad I did.
The most thrilling and emotional parts of this show took place within the game itself. The games are simple children's games, but are games that don't necessarily require skill. Most of the time, it's luck; which number you drew, which shape you got, that sort of thing. The game purports to be 'fair', but it's only fair in the way that real life is fair. You're stuck with the cards you've been given. The poor characters take part in the game because the real world is so terrible for them that the game is the best alternative they've got. Sadly, some even think they can win, despite (as we've discussed) the games being largely luck-based.
The characters are mostly pretty decent in this. The main character, Gi Hoon, is initially kind of a piece of trash, but you realize that he's a gambling addict, and this leads to him hurting the people he loves. He's not an inherently bad person who wants to hurt others, and you see that come out in the game, where he's one of the kinder people there. The rest of the cast are also great, not a weak performance in sight. I'd say the cop's plotline and character are mildly confusing and vague and you're just not that emotionally invested in it compared to everyone else. The show continues to get better and better as the games keep going and people die.
People die in very emotionally impacting ways, and I think they did all the character deaths very well. They often feel different too; whether it's because it was accidental, somebody cheated so they lost, or just bad luck. And the deaths can weirdly almost feel like a part of their character arcs. I don't know how the writers pulled it off but they did it well.
tl;dr it's really worth watching because it's not just trashy fun, it has so much to say about the unfairness of the systems in this world that keep poor people down. I'm not sure I'd rewatch it because it's so emotionally overwhelming at times but it is super good.