If you loved Decision to Leave, try The Handmaiden
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Park Chan-wook, and they both carry the foreign gem, mindfuck, sexy mood tags, and they sit in Romance / Thriller territory. If that's the register that drew you to Decision to Leave, the second film will land in a comparable space — through a different lens.
foreign gemmindfucksexy
What The Handmaiden is
1930s Korea, rain-soaked estate, a hidden safe. A handmaiden is hired, a con is set, a heiress awaits. Park Chan-wook perfects the art of deception.

