"귀신" (gwisins) refers to spirits or ghosts in Korean folklore. They are often believed to be the souls of deceased individuals who have not found peace. In traditional beliefs, these spirits can interact with the living, sometimes causing mischief or bringing messages from the afterlife. In Korean culture, there are various types of 귀신, each with unique characteristics and stories. Some well-known examples include 처녀귀신 (virgin ghost) and 산신 (mountain spirit). These spirits are often depicted in literature, movies, and art, reflecting the deep-rooted beliefs and superstitions surrounding death and the afterlife in Korea.