This is the 11134th most frequent Korean word.
기쁨의
"Joyful" or "of joy."
In this sentence, '기쁨의' is used attributively to describe '순간' as a moment characterized by joy, signifying a joyful occasion.
기쁨의 순간은 영원히 기억될 것이다.
The moment of joy will be remembered forever.
Here, '기쁨의' modifies '눈물' to indicate that the tears are ones expressing joy, highlighting an emotional reaction.
기쁨의 눈물이 그녀의 얼굴을 흐른다.
Tears of joy stream down her face.
In this usage, '기쁨의' is describing '메시지' as a message conveying joy, portraying a positive and pleasant news or sentiment.