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.
This movie contains 13 potentially triggering events.
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.