When she was sixteen years old, her mother died suddenly, leaving Fang Zi with a study, a letter, a key, and a mysterious man (his mother's secret friend during her lifetime) - Yi Wang.
It was also in that year that Fang Zi learned the secret that his mother had buried for many years, and decided to find his father who belonged to another time and space.
During the time travel, she played different roles and experienced different lives; during this time, she would be happy, annoyed, smiling, and shed tears, but she never forgot...