Learn what "so who is the lucky guy" means, when people say it, and how to use it naturally in English.

It is a casual way to ask who someone's boyfriend is.
From Why I Did It, Episode 9
The speaker casually asks who the person is dating.
Use this in friendly conversation when asking about someone's romantic partner. It can sound teasing, so avoid it if you want to sound serious or formal.
Scenes unlock real expressions as you watch
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