The film tells a story of 2 girls who were born on the same day and unintentionally switched at birth. Their lives are completed changed due to the misplacement when they are returned to their respective families.

90's Beijing Fantasy revolves around a group of six students at a middle school in Beijing in the early 1990s. Against expectation, Li Li Li (Meng Qin) doesn't do well in her middle school entrance exam and thus has to attend a third-class school, which she considers as her death penalty. Luckily, her childhood friend Wang Bo (Jiao Rui) ends up at the same school and becomes her sole comfort. But ...