편집증이 · 편집증을
paranoia
Example
그는 누군가 자기를 감시한다는 편집증에 시달렸어요.
He suffered from paranoia that someone was watching him.
Word parts
편 biased+집 hold onto+증 symptom
Literally 'holding onto a one-sided idea'.
Good to know
Don't confuse it with 편집 (editing); 편집증 always means paranoia.