Learn the tone, meaning, and better English alternatives around "must be important" with real scene examples.

This means the speaker thinks the visit or message is serious because it took effort to come from work.
From Conflicted Hearts, Episode 25
Someone remarks that the other person's visit from work must mean the issue is serious.
Use it when you want to infer that something is important based on someone making the trip. It is conversational and slightly explanatory.
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