first off as someone who has watched the drama - u Don't need to watch that in-order to "get" this, u can treat it as a stand alone, and any info taken from the drama is more or less explained. the movie was fun and great as a one off, but i can't agree with the hype - it's anticlimactic -

So Jin was turned into a minor character, and Jin Hee was the MC here - which is mindboggling as she didn't carry shit in the drama - but that's the problem with viewing the drama - i am among the few that wasn't blown-away by it, it had its good points but Jin Hee was not one of them. so if i had known this whole movie was gonna revolve around Jin Hee - think i might have passed...

the only scene that was freakin cool was the taxi scene in the tunnel - that took me back to Train to Busan, the dead having one objective and that's getting their target - so loved how that whole scene played out, that was cool - but everything else was meeh, load of clichés... sad considering the "evil" shaman was justified in bringing down the wrath of god on the asses of those money hungry pharmaceutical company executives - so So Jin's intervention was unwarranted (IMHO) and yeah i get its so the innocents (cops) that got hurt and were suffering's would recuperate. but it felt counterproductive - idk

again - a fun one off. and got to see So Jin smile at Seong Jun, took her a whole drama and a movie to be able too lol, heck of an achievement considering he a really good person - totally selfless and giving. but So Jin had her own baggage in the drama so it was understandable - but that's another story...