This is the 16130th most frequent Korean word.
불과할
"불과할" means "to be merely" or "to be nothing more than."
불과할 in this sentence implies the scope or extent of luck's influence is minimal, emphasizing the limitation.
그의 성공은 노력의 결과일 뿐, 운의 영향은 불과할 것이다.
His success is merely the result of effort, and the influence of luck will be minimal.
불과할 here is used to indicate that the group is just a minority, stressing its small scale in comparison to the total.
전체 인구 중 과반수를 넘지 못하는 소수에 불과할 뿐이다.
It is merely a minority that does not exceed half of the total population.
불과할 in this case suggests the role's function is limited to being auxiliary, showing a secondary scope.