Qiqiu Mozhu De Fangshi

Li Fei, who had to find "work" because his mother was seriously ill, somehow caught the eye of a rich big-boss. Not only did he have to help the boss-man with work, but also to accompany him to dine and entertain? Li Fei thought he was just a mean boss who liked to tease, and he found it hard to handle, even as he was charmed by the man. But then Li Fei discovered that his boss was actually the Devil himself...

(Source: Kuaikan, translated)