Learn the tone, meaning, and better English alternatives around "that's the only" with real scene examples.

This means the speaker believes the person is there only for one selfish or suspicious reason.
From She Is Mine, Episode 53
The speaker insults someone by saying there is only one reason they showed up.
Use it in a harsh argument when accusing someone of bad motives. It sounds hostile and disrespectful, so it is not appropriate in polite conversation.
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