-기 마련이다 means "bound to" or "its natural that" - expressing inevitability.
Natural outcome - 노력하면 성공하기 마련이에요 (if you try, youre bound to succeed)
Universal truth - Thats just how things are
Inevitable - Cannot be otherwise
Expresses natural law or principle
Often with universal statements
With time, youre bound to forget.
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