Zhe Hunjun De Hei Yueguang Wo Dang Ding Le

Duan Weiying transmigrated into the body of a new concubine on a harem mission. Her goal was suppose to beat out all the other girls to become the Emperor's favorite. But she had no interest in some unfaithful playboy Emperor, and she was going to just go through the motions and abuse her cheats to finish her assignment. That was until she found out the Emperor was actually a cool, beautiful Empress, who fell in love with Duan Weiying at first sight. Now both are caught up in each other…

(Source: Kuaikan, translated)