This is the 8887th most frequent Korean word.
강씨에게
"To Mr./Ms. Kang" (referring to someone with the surname Kang).
In this sentence, "강씨에게" is used to indicate the recipient of the action, the person to whom the flowers were given.
강씨에게 꽃을 선물했습니다.
I gave flowers to Mr. Kang.
Here, "강씨에게" identifies the person for whom the package was intended.
강씨에게 소포가 도착했습니다.
A package arrived for Mr. Kang.
In this example, "강씨에게" specifies the individual who received the greeting.