High school graduate Ke Xin dreams of returning to her grandmother's old house during summer vacation. It turns out that she was invited by the housekeeper of the Murong family to work with her cousin Murong Lan to save the Moon House from a hundred-year catastrophe. Before they joined hands, Ke Xin fell into the past time and space, realized her childhood, and the two met again, so they reconciled. Who knew that her fate was over, and when she returned to reality, she still kept her memories and walked alone...