Yun Shiyi, a servant, is forced to take punishment in place of a spoiled young master and is locked inside the dreaded Abandoned Beast Pen. Unexpectedly, he awakens the Myriad Beasts Evolution System. The worthless quail, groundhog, strange dog, and little snake in everyone's eyes are actually the Golden-Winged Great Peng, the Black-Armored Giant Bear, the Heaven-Devouring Giant Wolf, and the Green-Scaled Young Flood Dragon. After saving the four divine beasts, he uncovers the secrets of the old Beast Yard concealed for twenty years, the Yun family's soul-summoning bloodline, and a conspiracy involving the Myriad Beasts Soul Seal. The servant who was once trampled by everyone refuses to bow his head any longer. Using Myriad Beasts Returning Garden as his base, he fights to give abandoned spirit beasts a chance to survive while searching for his mother, trapped behind the Soul Gate.