Gwisin

In Korean folklore, Gwisin (Korean: 귀신) are a type of deity, divinity, spirit or ghost. They are considered similar to a yogoe (Korean: 요괴) or mamul (Korean: 마물). Unlike dokkaebi, gwisin are humans who have died.

According to folklore, gwisin may be found in many places. It is claimed that when an individual dies but still has ties to the world of the living, such as in the case of revenge or caring for a loved one, their spirit remains on earth to complete the task before going on to the underworld.