Went in with somewhat higher expectation because having watched Korean series and movies since the 2000's, very familiar with the female lead Song Hye Kyo and that's also how long she has been in the industry. Have to say that Dark Nuns is only her second venture into darker roles, first one being The Glory. Because she is too pretty she had always been previously offered roles as well, a beautiful woman in melodramas. Not entirely her fault because actors often don't get cast for more gritty roles because they're "too beautiful/delicate".
Having said that, Dark Nuns makes me want to see The Priests (2015) and compare both to see how good was the source and how good the sequel fares.
The story is nothing new, two nuns this time instead of priests doing everything they can to save a possessed boy. In my opinion Song still seems too delicate for the role of an exorcist strong enough to hold down the possessed and her decades of good girl image doesn't help, but I think she has potential to someday be a badass character.
Visuals of the movie was fine but with mediocre CGI on one scene. Jeon Yeo Been shines brighter here than in Vincenzo. Just a bit bothered by the idea of "divine powers ultimate combo" to ward off the pesky demon. Doesn't work like that.
Overall a decent watch. Definitely watch it if you're a fan of SHK to encourage future grittier, bad girl role pick from her.
Finally a truly biased last part: giving an otherwise 7 star rating an extra 1 star to support the hallyu queen, and so happy to see Dark Nuns does well while Bogota, Loh Ki Wan and Hopeless flop miserably, ha! If you know, you know!