When Song Joong-ki uses (like the double bieup : ㅃ), it produces a hard, abrupt stop in the throat. This mimics the implosive 'b' and glottal stops common in the Phnom Penh dialect of Khmer. Additionally, Korean's lack of tonal distinction means that when an actor whispers menacingly, the "flat" tones accidentally align with the tone patterns of Khmer declarative sentences.
In Vincenzo , the titular character frequently switches between Korean, Italian, and English. In specific high-tension scenes—particularly when he is threatening villains like Jang Han-seok (2PM’s Taecyeon) or speaking to his nemesis, Choi Myung-hee—Vincenzo adopts a low, guttural, rhythmic tone. Vincenzo Speak Khmer