How do I say 'I don't miss you.' or 'I didn't miss you.' in Korean?
(informally) towards close friends, girlfriend, boyfriend, family or in texting.

Question

Answer

In informal ways, you can say 너 안 보고싶어 or 보고 싶지 않은데? ㅋㅋㅋ.
Theses are commonly used in natural conversations. 
putting many ㅋㅋㅋ which is 'lol' will make it not  serious and be funny talks.

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