It feels like a collection of famous actors visiting because there are 12 reincarnations. "Let's see how many famous people we can have for this drama." Just for the actors' appeal it's a must watch. Every single actor can act! Then there are the visuals/crazy stunts/production quality all top notch. Impressive for sure!

I can't say the story has much depth as it revolves around the concept of "suicide is condemned therefore you have sinned."
That's how Korean Dramas are these days, pretty on the outside touching only the surface of society issues.

Just watch it for the actors and the stunts. It's entertaining overall.