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을 보호해야

must protect

→ 을
phrase Uncommon #10,155
must protect 을 marks the thing being protected, and 보호해야 expresses obligation: “must protect.” The form changes to 를 보호해야 after a vowel-ending noun.
KO: 우리는 환경을 보호해야 해요.
EN: We must protect the environment.

우린 시민을 보호해야 한다고요

I'm saying we have to protect the citizens.

— 폴링 다운 (1993)

자연을 보호해야 해요.

We must protect nature.