Hi,
NO, not legal, not possible. You have to exit with the passport you entered.
Before you ask: yes, you could try to re-enter immediately on your Korean passport, after having left Schengen for the UK. This might work (I'm not sure how well UK border patrol and Schengen border countries exchange information), but it's certainly not legal.
There is really is nothing further to add to what bentivogli has already advised you on.
Just to reiterate, it's illegal and the authorities will, for sure - give you a very hard time after they've checked your movements and paperwork.
It would be interesting to know in what country you plan to overstay. Depending on where you are there might be alternative options.
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