I'm a huge fan of the Vengeance trilogy by Chan-wook Park, comprised of this film, Sympathy for Mr. Vengeance, and Old Boy. The latter is probably the most well known, but Sympathy for Lady Vengeance is my absolute favorite.
A story about a young mother who gets blackmailed into taking the blame for a kidnapping and murder. Ultimately spending a chunk of her life in prison, getting free, then taking revenge. She doesn't just seek to kill him.
SPOILERS!: She infiltrates his entire life and creates a grand scheme, way more satisfying than simply killing him herself. END OF SPOILER!
Watching her evolve from obeying societal rules, inextricably linked to asian womanhood. Then move on to doing what she wants, but still having moments of doubt and guilt. Her transformation and growth is reflected in wardrobe and color symbolism. Used as a fantastic plot device rather than a superficial last minute thought.
The writing is incredible, the whole time i'm rooting for her. Rejoicing in her wins, and willing to throw punches (in my head) at the antagonists. The sideplots are incredible too: miscommunication between her and her daughter, a clueless bakery employee, her relationships between her jailmates and her bakery boss.
Admittedly have a weak spot for food in film. So i'll leave you with this cake. Highly reccommend this film over the other two, if you only pick one from the trilogy. But once you see this, you'll be compelled to pursue Chan-wook Park's body of work. I'm a Cyborg, But That's Ok is next on my list.