Answer:

사랑에 보답하지 않는 사람에 대한 Z세대이 집착

Gen Z people's obsessing for those who don't repay their love to them is called simping.

prolly is a slang in chat which means probably in English language.

probably:: certainly/아마도

simp is rarely known as a moron/ 바보/

섹끼/ 개세끼 is a curse slang in korean.

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apologies if my korean grammar has mistakes, im new to this.