Electronic anklet defacement and serial murders in Songpa-gu, South Korea, 2021

  In late August 2021, a 56-year-old male named Kang Yoon-seong, who had a history of robbery and sexual crimes, committed a series of murders against two victims in the Songpa-gu district of Seoul, South Korea. Afterward, he turned himself in to the police. On August 26th, around 5:00 PM, Kang Yoon-seong purchased a kitchen knife from a mart in Samjeon-dong, Songpa-gu. Prior to that, at 3:57 PM, he bought a cutting machine from a hardware store in Ogum-dong. Between 9:30 PM and 10:00 PM on August 26th, Kang Yoon-seong suffocated and killed a woman in her 40s whom he had met at a karaoke establishment, using a blanket. He claimed that he killed her because she refused to engage in sexual intercourse. The body of this woman was not discovered until Kang turned himself in. The police had visited Kang's residence five times, including on the day he damaged his electronic ankle monitor, from 6:00 PM on the 27th to 2:00 AM on the 28th, but they did not uncover the first murder. A police