A Woman After a Killer Butterfly(1978)

Original title: 살인나비를 쫓는 여자

A melodrama about a man who survives an attempted double suicide with a stranger while picnicking with friends. He goes on a cave expedition for a famous archaeologist where he discovers a skeleton several thousand years old. He meets the spirit of the skeleton in a dream, and then becomes romantically involved with the archeologist's daughter.