Kang Yu-jin is a leading specialist in the biological field. While collecting butterflies, he finds a rare breed and brings it home. His wife Sun-hi is glad to have her husband for the night and the next day sees a strange wooden doll amongst her husband

　A young couple's sex acts are witnessed by a young man through a hole in the wall. When the wife seduces him, they engage in an illicit affair. Chaos ensues when the husband learns about them.