Korean man, 24, kills girlfriend after beating her 514 times in 3 hours, says it was mistake & he didn't mean to kill her

On June 20, a 24-year-old Korean man named Jeon beat his girlfriend, 28-year-old Im Jan Di, 514 times over a period of three hours and 20 minutes, ultimately resulting in her death. The incident, known as the Gangseo torture murder, was featured on SBS' investigative show "Unanswered Questions" on October 24. Paramedics responded to the couple's below-ground apartment around 2:20 pm on June 20, finding Im unresponsive and already in cardiac arrest.

Jeon confessed to the police that he had assaulted her using a rubber mallet, claiming it was not his intention to kill her and that her lies had triggered him. An autopsy revealed that Im had 21 broken ribs and multiple ruptured internal organs. Forensic experts described the incident as torture, as confirmed by a home security camera that captured the events.

The production team investigating the case discovered that the couple had been working on a bizarre project called the "Dduri Kingdom," with rules designed to prevent fights, such as "the moment you choose to lie, you are no longer entitled to any humane treatment." Jeon was the only one permitted to carry out punishments, which Im's phone records indicated she had attempted to fight through the use of AI to formulate responses to Jeon's riddle-like questions.

Coworkers remembered Im as a kind and diligent individual, though her behavior had changed a year prior, with her frequently stepping away to take phone calls or arriving at work with visible injuries. Jeon's peers, however, described him as stubborn, single-minded, and unable to control his emotions, often leading to conflicts over trivial matters.

Jeon's father expressed his intention to support Im's family for the rest of his life and seek their forgiveness.