Just like the person who accidentally invented Viagra when trying to make medicine for heart disease, Moon Youngha tried to make Gongjin-dan but accidentally developed a type of medicine that can turn a beta into an alpha. Jung Pureum, who took that Gongjin-dan, collapsed during the English-Listening section of CSAT and manifested as an alpha. Moon Youngha is the owner of an oriental medicine clinic which clients avoid due to his identity as an omega. Jung Pureum is the college student next door who has been in love with Moon Youngha for over a decade now. In the end, Moon Youngha blurts out that he'll take responsibility for Pureum to avoid being sued by him... But he shouldn't have done that. That's why one has to be careful when signing contracts. Will Moon Youngha be able to suppress his heat cycles with traditional medicine while maintaining the peaceful life of an Omega passionate of his work like before?