How to say, "I am thinking of you," in Korean?
I want to say this to my sister who is trying to have a baby, but is having a hard time conceiving so I just want to let her know that she is in my thoughts and prayers. It is not meant in a creepy or romantic way, but just as a caring concern sort of way, if that makes any sense.

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Answer

Assuming your sister is older than you, you can say:
- 나 언니 생각 많이 하고 있어.  (I am thinking of you)
- 언니 생각이 항상 내 마음에 있어.  (Your thoughts are always on my mind)

If she's younger, you can replace "언니" with her name or "네" (your).
"언니" is "older sister" as referred to by a female.