Asking this question is very similar to asking “what makes that person unattractive?” It could be a short torso, long arms, weird legs, skin blotches, asymmetrical face, etc. It can also be something they artificially enhanced like a bad botox job or a bad breast enhancement.
Similarly in music, things can range from natural characteristics such as an unusual larynx issue, bad teeth, weird mouth shape or size, nerve damage in the lips or jaw, etc. all these issues can cause bad resonance, lisps, or unusually nasal voices, amongst other unwanted characteristics. Equally, you can damage your voice by smoking or drinking (depending on the style it can make your voice more or less attractive).
Additionally, you can artificially enhance (or destroy) a voice with digital processing techniques. Over/under compression, EQ, reverb & delay are common processing applied to voice and instruments.
K pop tends to be overproduced, but very demanding in the talent department so I would put my money on the over-processing of the voice (digitally) is what puts you off.
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