After Losing My Memory, the Twin Brothers Dote on Me Every Day

[A cool-on-the-outside, warm-hearted Saintess X a sharp-tongued, insecure, lovesick younger brother X a courteous, aloof, and brooding older brother] The Saintess has a cheat-like advantage in medicine and is clueless about everything else. There may be a little angst for the heroine, since there are two male leads! A hundred years ago, the Wu Ling Clan survived by obtaining the power of the underworld. As a fighting force outside the Three Great Nations, they were naturally coveted by the rulers of each country. The Three Great Nations and the Wu Ling Clan agreed that for the next hundred years, every ten years they would choose a Saintess to marry into one of the three nations in turn, ensuring that no single country could control the Wu Ling Clan's power. It is now the final decade, and the turn has come for Wen Xinyu, an expert in traditional medicine, to marry into Xuandong, a nation that claims to be the rightful successor. But just before her wedding, Wen Xinyu is poisoned, and her life hangs in the balance. Has the Wu Ling Clan chosen sides and decided to break the agreement, or has someone really tried to murder its Saintess in order to sow discord between the clan and Xuandong? The Crown Prince of Xuandong sends his younger brother, a spy planted in an intelligence organization, to get to the bottom of things.