I watched this movie in four parts... lol the first three times, I kept falling asleep. Nothing was really happening, it was boring, and I had to get my friend to recap for me. Thank goodness my friend kept prodding me to finish it, because halfway through the movie literally goes from 0 to 105. It's all action, gore, fighting, and the main lead being OP af. If you like seeing the protagonist beat up foes, this one's for you. Story-wise, though, there's a lot missing.
(Also, one of the reasons she made me watch was to see Da Mi and Woo Shik before Our Beloved Summer aired lol. I like both actors - they have young faces and bring refreshing emotions to the screen.)

PROS
❀ Good introduction to the actors | I haven't watched Itaewon Class but Kim Da Mi left an impression on lots of people and she did a good job in this movie too. Even though her character was written very lazily, she still managed to give off very intelligent and savage vibes for her character. Woo Shik was great in Parasite and in The Witch, he plays the lunatic working for the evil scientist quite well. Honestly, I'm impressed with how well he expressed the character because his lines bordered on cringe sometimes. The Witch is a testimony that movies can be successful, despite poor writing, due to the execution of the actors and the producer.
❀ Fun action, especially towards the end | Once everything gets out in the open by the middle of the movie, the action is non-stop. You basically watch the main character Goo Ja Yun beat all the bad guys up in a very satisfying way. The production quality for the action was eye-catching and vibrant, which makes up for all the boring scenes in the beginning. Like I said, the movie goes from 0 (nothing big happening) to 105 (a LOT of things happening) lol. So if you're struggling while watching, try to push through to reach that middle part.

CONS
✕ Really sloppy writing | This movie takes the idea of "genetically engineered superhuman children" and... that's it. Lol. It doesn't progress past the vague idea of one of the superhuman children turning against the researchers and nothing is deep. Main character Ja Yun wants to live and protect her foster parents. That means getting rid of the people after her. Solution? Kill those people. I'm a huge fan of sci-fi and have seen this vague storyline done 10+ times through Western books/movies/etc. The Witch: Subversion doesn't offer anything new, unfortunately, nor does it stand out against the myriad of stories with the same theme. The story doesn't have depth, the characters barely have depth, and the superhuman plot is not used to its potential. Everything about this movie just screams "shallow."

OVERALL
Honestly I feel like you shouldn't watch it until Part 2 comes out. Part 1 ends in a cliffhanger, there's barely a storyline going on, and the characters felt like caricatures. The reasons I kept watching were 1) my friend basically forcing me and 2) the main actors. The action towards the end and the female lead kicking ass make it worth the watch, but everything else is a hazy memory in my mind.

(Note: My rewatch value is set to 5.0 always as a default as I'm not the type to rewatch dramas EVER. Thus, I do not take it into account when calculating overall score.)