The phrase is frequently used as a title or key scene in fan communities (e.g., TikTok-based fanfics involving characters like Rebekah Mikaelson):

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The dialogue-heavy approach and the slow-burn chemistry between the leads.

The catchy chorus focusing on the "smile of the brunette" ( o sorriso da morena ) makes it an instant party favorite.

This story leans heavily into the "enemies-to-lovers" or "mysterious stranger" tropes. The tension in scenes where characters exchange "ironic, self-assured smiles" is palpable.

4/5 stars. It doesn't reinvent the genre, but it’s impossible to listen to without wanting to dance. 2. Fanfiction/Online Story Review

If you are reviewing the viral hit popularized by artists like JJSV (Juarez Junior & Saulo Vaz) :

"O Sorriso da Morena" appears to be a popular lyrical phrase or title associated with different creative works, primarily in Brazilian pop culture, rather than a single definitive book or movie. Because it can refer to several things,