The heroine, Mo Chunying, is a medical student. A series of unexpected events before graduation sets off a succession of dreams. Strange fragments from those dreams pique her curiosity and guide her in searching for her roots, only for her to uncover the shocking truth about her own origins. The hero is an innocent young man who appears by her side as a guard when she first enters a dream. A sense of déjà vu stirs the heroine’s memories, and she discovers that both of them are participants in an experiment, bound together by a destiny that was mapped out long ago. After taking part in numerous experiments, they are selected to join the “Time Vault” program and become inseparable partners and “Guardians of Time.” Led by her grandfather, Ma Shiyou, Professor Zhang, and the other members of their team, they embark on time-traveling journeys to save humanity. Along the way, they uncover the origins of Earth, the truth behind myths and legends, and all manner of hidden historical secrets. The pair’s transmigrations also become an indispensable part of history’s evolution. As they continually awaken supernatural abilities within themselves, they travel between the “Three Realms,” protecting humanity’s peace and security. Part One: The Ancient Kingdom of Guzhu.