An aftershock caused by an earthquake twelve years ago made a time-space connection between the young Xiao Li and his childhood. At a class reunion many years later, Xiao Li met Song Qian, a girl who had a crush on him. The secret of his father's disappearance and the memory of an accident caused by a game of hide-and-seek were gradually evoked. In the flowing river, Xiao Li gradually approached the truth in his heart and resisted the oblivion from the present.