The recent murder case at Sindang Station on lines 2 and 6, in which a Seoul Metro employee stalked and stabbed his former female colleague in her 20s to death in the station s bathroom, has led to an increase in sales of self-defense tools and weapons. A Gyeonggi Province-based office worker in her early 30s, who wished to be identified only by her surname, Kim, said she bought an alarm device and pepper spray for her protection after reading about the subway station murder in the paper last week.