I've just spent 1h30 imagining myself killing people left and right...
Now it's over, and i'm in a crazy fool mood,
Here's the kind of story this is.
If you enjoy bisounours and wanna have faith in the goodness of the human race, never watch this.

Now for my review...

The music, sound effects, work for me.
It's dark, it suits the movie's story.

The visuals are very good, the red dress kicking ass FL thematic is super effective.
The action scenes are very well done.

The acting is excellent(special mention for Park Se Wan).

The story works as intended. You will support the lead, hate the vilains, and wish for a good ending.
But the FL finds her targets so easily sometimes that it's not always credible.
Some parts of the movie are a bit weird or rush, exemple: the link between the neighbors and the last villain.

Overall, i will give this movie a very good rating, yet there will be no rewatch.
It will take me some time to digest it.