I have a theory. What if "Killing Stalking" isn't about Sangwoo or Bum, but about Sangwoo's mother? It's a common theme that Yoon Bum resembles Sangwoo's mother, and at the beginning of the series Yoon Bum was a stalker. So, what if all the flashbacks Sangwoo has of his mother is because she also stalked him? Now it's like he's haunted and can't get away from his mother "stalking" him.
I meant the title. Killing Stalking is obviously about Sangwoo and Yoon Bum, but though everyone assumes the title refers to Bum and Sangwoo I think it's more complicated than that.
I have a theory. What if "Killing Stalking" isn't about Sangwoo or Bum, but about Sangwoo's mother? It's a common theme that Yoon Bum resembles Sangwoo's mother, and at the beginning of the series Yoon Bum was a stalker. So, what if all the flashbacks Sangwoo has of his mother is because she also stalked him? Now it's like he's haunted and can't get away from his mother "stalking" him.