The first is wrong. You need to say "whom". Even though you end the sentence with "with", you are using "who" as the object of the preposition "with", and that is an error.
2023년 8월 31일
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Yes, they are both correct…
But
Some very strict grammarians avoid ending sentences with a preposition (like with). However this is not something you really to worry about unless you are doing something like giving a speech or writing a dissertation.