This is the 1457th most frequent Korean word.
직원들의
"Of the employees" or "employees'".
Here, '직원들의' functions as a possessive modifier denoting ownership of '노력' by the employees.
직원들의 노력이 기업의 성공을 이끈다.
The efforts of the employees lead to the success of the company.
In this sentence, '직원들의' indicates that the '의견' belongs to the employees.
회의 전에 직원들의 의견을 수집했습니다.
Before the meeting, I gathered the employees' opinions.
Here, '직원들의' is used to show that the '휴게 공간' is specifically designated for the employees.