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My headcanon is that Cale has a deep deep voice and not naturally but more because OG!Cale was a alcoholic and his vocal chords are fucked up.
So, like the Gen Z that he's, he makes the "Hello, baby girl" to Choi Han because is the only one that will understand it (bc Choi Jung Soo memories). It goes like this:
Cale: *walking into the room and with the most deadpan face he says to Choi Han* Hello, Baby Girl *and walks out*
Choi Han: ????? *confused noises bc low-key that was actually good*