This is the 3355th most frequent Korean word.
노력에
"노력에" means "to effort" or "to endeavor" in English, depending on context.
In this sentence, '노력에' (noryeoge) is used as part of a phrase to indicate the means by which an action (success) was achieved.
그의 성공은 그의 노력에 의해 이루어졌다.
His success was achieved through his efforts.
Here, '노력에' (noryeoge) is being used in connection with '보답' (reward), indicating dedication or effort being the source of the expected reward.
노력에 대한 보답을 받는 날이 올 거야.
A day will come when you will be rewarded for your efforts.
Lastly, '노력에' (noryeoge) refers to the content of the conversation, showing a possession-like relation or topic related to efforts.