It's "한국을 떠난 지 한 달이 지났다." in a declarative sentence. Or if you're talking to someone, it's either "한국을 떠난 지 한 달이 지났어" or "한국을 떠난 지 한 달이 지났어요" depending on the person you're talking to.
August 19, 2017
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Well I stand corrected. So much for nothing.
August 19, 2017
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