The Love by Hypnotic (2019)

Princess Li Ming Yue of Xiyue is sent to marry Prince Li Qian of Beixuan in a diplomatic arrangement. The disciplined Qian and free-spirited Ming Yue clash, each hoping the other will call off the engagement. When Ming Yue unintentionally triggers Qian’s lost memories, he proposes a marriage of convenience to uncover the truth. However, Qian's brother, Li Xun, wants those memories buried to prevent them from jeopardizing his ambitions for the throne. A battle for power and the crown unfolds—will Qian regain his past, or will Li Xun seize the throne? (Source: MyDramaList) ~~ Adapted from the manhua "Prince, Don't Do This!" by Dong Man Tang.