Learn what "must be really" means, when people say it, and how to use it naturally in English.

It means the speaker is making a playful compliment that can sound flirtatious.
From The Dumb Billionaire Heiress In Love Part Ii, Episode 8
Someone flirts by commenting on how hot or uncomfortable the other person must be in a suit.
Use this in romantic or playful conversation. It can sound suggestive if said to a stranger or at work.
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