I was able to participate in a talk where the director explained the original meaning of the title. That really blows my mind.
I kinda wish the title would remain like the Korean one: "Two women wearing the same underwear". This would let people understand more about the plot from the beginning and what looks weird would just become understandable.
Slow movie but I really recommend it. Really great technique for creating tension.
The value of using silence into long scenes, or disturbing noises too, lets the watchers go into a self-discovery about their own past or present.
You can see the real struggle in a really common family relationship!