Subtitled. Although in general, I'm agnostic, unless the dub is particularly annoying (Wasabi comes to mind). I was just lazy, and allowed the default.
If you can imagine a "Battle Royale" type scenario where the players volunteer to play, for various reasons (mostly escape from financial ruin).
Writer/director Dong-hyuk Hwang is a visionary. Highly stylized sets being the most obvious example in Squid Game. I will definitely be checking their other stuff out.
Jung Jaeil (he of Parasite fame) provides the perfect soundtrack.
Episode, "Gganbu", was particularly unnervingly emotional.