Never mind.🤷🤔 
  
 신경꺼 negative 
 걱정하지 않아도 돼 positive 
 너나 잘해 negative
 괜찮아 positive
Some phrase's meaning looks like Cameleon. They are changing the meaning depending on situations (i.e. Tone, Contexts..)
Here you can see various meaning of Korean for never mind.
I hope it helps you
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