눈치가 없어 (you’re tactless)
눈치 [n] tact; sense; wits
an ability to understand and know someone's mind or situation even though they have said nothing.
Semi-polite/polite – 눈치가 없어요
>> This phrase is used when the other person does or says something that is not tactful, or clueless of what’s going on around them
>> In the dialogue, the son is playfully reprimanding his mother for being tactless when they were tactfully trying to tell her that they’d already eaten to save her trouble
>>We can say “눈치가 없어” to someone is tactless, can’t take a hint or is oblivious to their surroundings