A female detective investigates the cause of a high school girl’s death and uncovers a disturbing truth.

Yoon-jung, in her fifties, still meets the man she loved thirty years ago in her dreams, now a blurred presence between life and death. Ido, in his twenties, wanders in search of meaning, while Roa remains beside him like a distant vision. As their stories unfold, the lives of Yoon-jung and Ido gradually overlap, unsettling the boundary between reality and dream.