One of Netflix's best, I would say - very well done, sort of a combination of The Hunger Games and the Saw series.
I would've given it 5 stars - if I hadn't figured out the old man's story by episode 3 :/
Still worth a watch, though, because it's a master class in filmmaking. (Go South Korea, lately, they're on filmmaking fire!)
When I first said it out loud, my husband laughed "Noooo, can't be lol."
I said, "I dunno, we'll see. If I'm right, I'll tell you the subtle, odd, clue moments that tipped me off."
Let's just say that I was right - and my husband is amazed lol.
And now that I've told him the moments that gave it away for me, he's like, "Oh, yeahhhh."
Hey, don't get me wrong, my husband is super smart, but I'm no genius - it's just that I just know film ;)