Because the two protagonists have memories of seeing each other in the closet when they grew up (they feel familiar with each other), the action to save the watchmaker's family must have happened, and after the rescue was successful, the two disintegrated worlds were destroyed. Without the future, they wouldn't have this memory either, because the existence of the timeline in which this event takes place itself represents the destruction of two divided worlds.
According to the setting in the play, the events of Adam and Eve's world all happen in a closed loop of time, and the ending branch has no future, so it cannot form a ring, that is, a normal timeline, so what is done in the ending branch is the world of Adam and Eve. It should be impossible for the protagonist to know, but the protagonist and the others know, so this may still be in a larger circle, and the names and familiar clothes of the two black oilers and mother who appeared in the first crossing are foreshadowing.
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