Renowned zoologist Xu Yao, after receiving the highest honor in animal medicine, put everything aside and returned to the old director's zoo. To repay him, Xu Yao worked as a veterinarian in the small zoo, but was severely punished by the new supervisor Wang Ling for not injecting sedatives according to regulations, as everything must go by the rules from now on. After flying into a rage and ignoring advice, Wang Ling used sedatives below the safe dose during a leadership visit, causing the predators to lose control. Wang Ling called in new veterinarian Qin Zheng to squeeze Xu Yao out. Ultimately, during the reception of foreign guests, heavy losses were incurred, leading to the zoo's closure. Xu Yao chose a large animal research organization and joined with an annual salary of tens of millions.