Gajokgangyejeungmyeongseo

AZ Company's marketing ace, Gu Yeon-Seo. The secret behind his perfect looks and abilities is that he's a gumiho who grew nine tails in 200 years. Everyone believed he would become a thousand-tailed fox, but he's been living as a proper human after passing the qualification exam, college entrance exam, and even job hunting. However, his identity, which he's been keeping secret all along, is discovered by developer Yu Min-Hyeok in a single moment of mistake, and everything is in danger...! And his magical powers don't work on Min-Hyeok?!

A gumiho's bumbling, neighborly romance that targets Min-Hyeok and his younger brother to protect his peaceful daily life!

(Source: Bomtoon, translated)