-(으)ㄴ/는 이상 means "since" or "now that" - given a situation, something must follow.
Given situation - 약속한 이상 지켜야죠 (since you promised, you must keep it)
Commitment - Now that X, must do Y
Obligation from condition - The situation demands action
Implies obligation or natural consequence
Often followed by 해야 하다, -겠다
Now that youve started, you must finish.
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