This is the 11649th most frequent Korean word.
남겨진
"Left behind" or "remaining."
In this sentence, '남겨진' describes '편지' (letter), indicating it was left behind or remains.
남겨진 편지는 아직도 읽히지 않았다.
The letter left behind has not been read yet.
Here, '남겨진' modifies '추억' (memories), implying these memories remain and elicit emotions.
남겨진 추억이 마음을 아프게 한다.
The memories left behind make the heart ache.
In this context, '남겨진' describes '물건들' (items), showing they were left as remnants in the absence of the person.