To bring Vincenzo Cassano to life, Song Joong-ki underwent rigorous training. His real-world linguistic abilities include:

The character Vincenzo Cassano, portrayed by , is known for his proficiency in Italian and Korean . He also occasionally uses English and Mandarin within the series. However, the "Khmer connection" largely exists through:

: A Khmer-language dub of the series was released in Cambodia (often cited as "Part 153" in viral TikTok clips), where the voice acting was so seamless that many fans joked Vincenzo "speaks Khmer better" than his original languages.

: Some online articles and AI-generated TikTok videos have created a fictional backstory claiming Vincenzo spent time in Cambodia as a young boy and was raised by a Cambodian woman. Note: This is not part of the official show's canon. .