Manga by author Spoon/调羹

The female MC Yue Yao aka Bai Fei, is disguised as a man and hiding among the largest underground family in the city the Ling Family to become the Young Master's right-hand person. Using her identity as a 'brother', she became acquainted with the carefree Young Master Ling Ye, until a particular assignment arrives where Ah Fei, who is dressed as a woman, couldn't resist her own inner desires and kissed Ling Ye while drunk...