The Raincoat Killer: Yoo Young-chul and the People Who Set the Trap
Yoo Young-chul killed 20 people in Seoul between September 2003 and July 2004. He started with wealthy elderly people in their homes, then switched to women who worked in the massage trade. He wasn’t caught by a police investigation. He was caught by the owners of mobile massage businesses, who tracked one phone number, set their own trap near Sinchon, and held him until a detective arrived.