Gomsin
Gomusin are a traditional type of Korean women's shoe. The term "Gomusin" is also used as a social designation; in this sense it refers to young Korean women who are waiting for their boyfriends to return from the compulsory, two-year service in the South Korean army. Its origin comes from "gomsin", which means "wear the rubbers back to front". The word is an abbreviation of Gomusin. Since all Korean men are obliged to serve in the army, it is common to find "gomsin" among Korean women who are between twenty and thirty years old. "Wearing gomsin" or  putting on gomsin is slang widely used online in Korea. There are terms to describe men, such as "combat boots". When a girlfriend remains devoted to her boyfriend throughout his service, they may be called "wearing kkotsin." Kkotsin are a type of flower shoe. Gomusin. "Gomusin" (Korean pronunciation: [komuɕʰin]) are shoes made of rubber, built in the form of traditional Korean shoes. The shoes are wide with low heels. Gomusin for men were modeled after ""gatsin"" (갖신), and ones for women were "danghye" (당혜). Gomusin first appeared in the early 20th century; they were easier to keep clean than "danghye  and jipsin" (straw shoes) and they could be worn when during wet weather, attracting popularity and replacing traditional footwear. Putting gomusin on backwards. The term "putting gomsuin on backwards" when applied to a couple, refers to the termination of their relationship because the girlfriend chose to pursue other men during the boyfriend's military service. This expression originated from an old Korean tale in which a wife has an affair during her husband's absence while fighting in the Korean war. After the war, the husband returns to find his wife in bed with her lover. In her shock, she  runs out quickly, putting her "gomsuin" on backwards. This expression has been compared to the English metaphor, "writing a Dear John letter". Online community. In modern Korean society, there are many communies for "gomsin", where users may commiserate with each other and share tips for enduring the long waits.