The film uses a :

At its core, "My Tomorrow, Your Yesterday" is a film about the power of human connection and the ways in which our lives are intertwined. The movie's use of music as a narrative device is particularly noteworthy, as the violin and piano pieces performed throughout the film serve as a metaphor for the harmony and discord that exist within our relationships.

The film is structured in two halves:

As the story unfolds, the audience is taken on a journey through the lens of Sooyoung's fragmented memories, piecing together the events that lead to the convergence of their lives. Through a series of non-linear flashbacks, the film skillfully conveys the depth of their emotional connection, raising questions about the nature of fate, love, and the human experience.