You can see gwishin all over Korean horror movies, and the Japanese version of the image went global thanks to the 1998 film The Ring.
The idea of a gwishin is very similar to western conceptions of ghosts: they are the restless souls of the dead who refuse to move on, usually because of something they haven’t completed. In most stories their motivation is revenge, but there can be other reasons. Also like western ghosts, most gwishin are depicted as floating, legless, and translucent. They may move objects around, and their presence is accompanied by an eerie feeling, a light breeze, or a cold sensation, very much like western ghosts.
Gwishin are usually women or girls with long black hair, and most commonly they are depicted wearing white funerary clothes