Brutal murders frequently plague the city; the police have repeatedly tried to track down the culprit but have always failed. Everytime the officer had an investigation, they always return empty-handed—finding no trace of the perpetrator, no evidence, and no signs that anyone else had ever been there.

The perpetrators are a pair of couple: Guest and Viktor. They became partners when they embarked on this killing spree together. Viktor is a long-time fugitive serial killer of unknown identity, while Guest is Viktor's protégé. Guest once suffered from severe depression and went to a building with the intention of committing suicide, but Viktor found him there and taught him a unique way to find happiness: killing.

A teenager—looking like an ordinary kid—lies stiff and dead, the victim of a brutal murder. Their cheeks are slashed wide to form the impression of a smile; their abdomen is split open, exposing their entrails; and their body is nailed to the wall in a waving pose, creating a chilling atmosphere inside the abandoned building.

At the scene, the two killers—Viktor and Guest—are cleaning the tools they just used to kill and dissect the victim. They appear remarkably calm for people who have just committed such an atrocity.