It is an inside joke in the kdrama fandom, particulary the fans of the kdrama - Weightlifing Fairy Kim Bokjoo. If a female wants her crush to pay attention to her or just be interested in her, then she should ask 'Do you like Messi?' to him. Men generally like sports like football, so it would impress them to find a girl sharing similar interests. That's how it is explained in the kdrama.
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I don't know the purpose of using uppercase letters, like that's unprofessional.
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