Do 당신 think Killing Stalking is a Stokholm Syndrome Story

Yes, it is.
Yoon has BPD, Borderline Personality Disorder, and so he's a bit...different.
Borderline personality disorder (BPD) is a serious mental illness that centers on the inability to manage emotions effectively. The disorder occurs in the context of relationships: sometimes all relationships are affected, sometimes only one. It usually begins during adolescence 또는 early adulthood.
To be in 사랑 with someone who abuses 당신 and even threatens to kill 당신 is probably a clear sign of Stockholm's Syndrome. Seeing as most people would just grow to resent someone...