I'll keep it short.

The fights were incredible, especially the "fight club style" one. This fight left a pretty heavy impression on me since it portrayed in a somewhat experimental way. It was most likely taken in one take since little to no cuts at all were present. I don’t even want to know how much time this took.

The story was interesting as well, at some point the focus on her revenge was somewhat lost but I was still satisfied with the end since a good and fitting solution was found.

The acting was pretty good as well, I especially liked Ji Woo's mix of expressionlessness and fury/hate. This made it pretty obvious that she was only set out on revenge and lost herself in it.

Overall, I think it is a great watch with a rewatch potential. I hope you consider watching it.

Enjoy.