모름지기 A는 -아/어야 한다
by all means, as a matter of course, ought to
Example
학생은 모름지기 공부를 열심히 해야 합니다.
Students ought to study hard, as a matter of course.
Word parts
Looks like 모르다 'not know', but it means 'ought to' — don't be fooled.
Good to know
Pairs with -아/어야 하다 to state what a kind of person should do.
Related words