Twenty-eight-year-old Yang Xiaolu had a soul exchange with her eighteen-year-old self because of a mirror in the attic.
At the age of twenty-eight, she returned to college and resumed her youthful journey, while at the age of eighteen, she had to face the mess she had left behind in the future.
The self seven years ago and the self seven years later are trying to find ways to go back and start a new life through the mirror...