This is the 199th most frequent Korean word.
이러한
"Such as this" or "like this."
In this usage, "이러한" describes the nature or type of clues being examined.
형사는 이러한 단서를 조사 중입니다.
The detective is investigating clues like these.
Here, "이러한" is used to specify the kind of reasons that influenced the decision.
나는 이러한 이유로 결정을 내렸습니다.
I made the decision for these reasons.
Here, "이러한" introduces a specific type or example of situations being referred to.