Seo-jin has lost his wife in a car accident and tries to find the culprit through hypnosis. But in hypnosis he keeps seeing his long lost sister and fails to find the culprit. One day, You-jin returns home after 25 years, but Seo-jin feels sense of otherness and discomfort. He tries to convince his family that she might not be his sister but no one listens to him.
