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South Korea is understandably upset at the news of its northern rival in sending troops to Ukraine. I think that what they specifically have a problem with is that NK will now have experienced units whereas before they didn't have any that have served in a war. They don't want NK to level up. So, the goal is to make Russia want to send them back. Here's a collection of a few articles that you can peruse at your own leisure:
South Korea considers sending troops to Ukraine
https://www.pravda.com.ua/eng/news/2024/10/21/7480745/
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South Korea’s President on North Korean Troops to Russia: We Will Not ‘Sit Idly By’
https://www.kyivpost.com/post/40871
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South korea demands "immediate withdrawal" on NK troops from Ukraine
https://www.kyivpost.com/post/40855
