For those who may not be familiar with the drama, Vincenzo Cassano, played by Song Joong-ki, is a mafia consigliere who has been living in Italy for most of his life. Despite being Korean by birth, Vincenzo's prolonged stay in Italy has made him more comfortable speaking Italian than Korean. However, in one of the episodes, it is revealed that Vincenzo can also speak Khmer, a language spoken in Cambodia.