without fail; at any cost; certainly

Explanation

1. without fail; at any cost; certainly
By all means under any circumstances.

2. precisely
Exactly without any difference.

3. perfectly
Very well.

4. satisfactorily
In a very satisfactory manner.

5. as if; just like
In a very similar way.

Examples
모든 직원들은 회의에 꼭 참석해야만 한다
선생님은 학생들에게 내일까지 숙제를 꼭 해오라고 하셨다
그 은행은 일요일이면 꼭 문을 닫는다

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