Doomsday arrived, heavy rain triggered animal mutations, extreme cold and extreme heat alternated, and human civilization collapsed. In her previous life, Ye Jin was cheated out of her ancestral beast bone whistle by her best friend Xia Wei, and was betrayed by her cousin Ye Fan, dying a miserable death in the mouth of a mutant beast. Reborn back to seven days before the doomsday, she swore to guard the bone whistle, take revenge, and wipe out the grudges. Ye Jin activated the bone whistle with her blood, bound the Ten Thousand Beasts Command System, and could command all animals within a hundred miles radius. She sold real estate and loans to stockpile supplies, ambushed bandits with animal packs in the black market, and acquired weapons and equipment. After the doomsday arrived, she led her family to retreat and defend the ecological observation station, using mutant beasts to build a defense line. After losing the bone whistle, Xia Wei colluded with the Black Dragon Gang to besiege multiple times, all of which were defeated by the animal packs.