A former serial killer Byung-su gets diagnosed with Alzheimer’s and when a series of murders occur near his town, he worries whether the killings are his doings. Then, he comes across Tae-ju and realizes that he’s the killer. He reports this to the police, only to learn that Tae-ju is one. Byung-su tries to find evidence against Tae-ju, only to raise the young killer’s interest on him and his dear daughter.
The cat dies of an overdose. You see it getting an injection as a cancer treatment. The main character realises that he had given the injection before. Then you see the lifeless body of the cat and the pet owner crying.