Kaka and Sil, who are in love, escaped from an underground science laboratory in Eastern Europe and were adopted by Nian Changkun, a business tycoon with a strong family fortune. They became brother and sister. Kaka was destined to protect the Nian family's property and was appointed as the heir by his adoptive father. During the financial crisis, Nian's company was on the verge of bankruptcy. In order to save Nian's company, Nian Changkun wanted to marry Xier to Li Yan, the son of Mayor Li, a senior government official. Kaka promised to find a way to alleviate the crisis. Due to the reagent injected into humanized animals by scientific researchers, this reagent may not appear until adulthood. From the age of 22, Kaka will turn into a werewolf every full moon night. The destructive power is terrible, and the government does not allow the existence of werewolves. Mayor Li deliberately advanced the wedding one day after the full moon night. Kaka, who had found a way to resolve the crisis, learned the news and turned into a werewolf on the way. He was assassinated by Mayor Li. The marriage was just a conspiracy by Mayor Li to destroy Kaka. Kaka returns from his escape, and in order to protect their love, he pretends to be friends with the mayor's daughter and gets close to Siel. Kaka's uncle borrowed the characteristics of his werewolf mutation. During an intra-family inheritance fight, his two-month-old fetus was killed. Kaka could only strengthen himself to cope with the turmoil in the family, escape from the government's pursuit and perverted entanglements of scientific researchers, practice controlling the various uncontrollable instincts of becoming a werewolf, work hard to rise, and finally successfully control his body changes and take charge of Nian's enterprise.
Concept: Can humans and animals have interchangeable identities?