This is the 14868th most frequent Korean word.
박천둥에게
"To/for Park Cheondung" (a name in Korean).
Here, '박천둥에게' denotes the recipient of the letter.
박천둥에게 편지를 보냈어요.
I sent a letter to 박천둥.
In this case, '박천둥에게' indicates the person to whom the question was directed.
박천둥에게 질문을 했어요.
I asked 박천둥 a question.
Here, '박천둥에게' identifies the target of the expression of gratitude.