In a modern metropolis where myriad worlds converge, Bai Yu appears on the surface as an ordinary office worker, but secretly is a core cadre of the mysterious organization "Dreamland". He originally only wanted to protect his dependent younger sister Bai Ling, but unexpectedly discovers that his sister has actually become a member of the holy beast team. One situated in the dark side, one shouldering the mission of protection, the brother and sister, while concealing their identities from each other, repeatedly get entangled in the same crisis. As powerful enemies appear, the boundaries of factions are broken anew, and Bai Yu must make a choice between organizational stance and family responsibility, and hand in hand with partners protect the city and their shared tomorrow.