Learn the tone, meaning, and better English alternatives around "i'm on duty" with real scene examples.

It means the speaker is saying they are working and doing what their role requires.
From My Handsome Bodyguard, Episode 24
Someone is saying they are on duty and following their job responsibilities.
Use this to explain why you are acting a certain way at work or in a formal role. It can sound firm if you are pushing back against someone.
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