【Movie】Why does he poison his girlfriend? To knock her out and scheme, or protect her?

In the Northern and Southern Dynasties, the society is in turmoil. Hui, ‘The South Blade’, established 48-Camps to take those poor and vulnerable people. Twenty years later, a young man named Yun breaks the quiet life of 48-Camps. Meanwhile, Fei, the descendant of ‘The South Blade’ has been involved in an unknown life journey. From then on, Fei started her own legendary story with Yun who is always by her side. When the deepest secret has been discovered, Fei and Yun decide to fight with their rival together for the people. In the end, Fei becomes the new ‘South Blade’ to lead a brighter future.