"Yan Ruyu is a main character in the Japanese manga series ""Empress's Harem"". She is a beautiful and strong-willed young woman who serves as the head of the imperial harem. Her name is mentioned several times throughout the series, as she plays a significant role in the story.

At the beginning of the series, Yan Ruyu is introduced as a highly skilled and influential member of the imperial harem. She is respected by her peers and feared by her enemies, as she possesses a sharp wit and the ability to wield her power with precision. Her name is first mentioned when the main character, a new concubine named Xia Yuhe, first encounters her in the harem.

Throughout the series, Yan Ruyu's character is further developed as she becomes embroiled in various political machinations and power struggles within the imperial court. Her name is frequently mentioned as she navigates these complex situations with grace and cunning. She is often depicted as a stern and unyielding figure, but is also shown to have moments of vulnerability and tenderness.

Despite her position of power, Yan Ruyu is not immune to the emotional and physical pressures of life in the imperial harem. At one point in the series, her name is mentioned when she falls ill, forcing her to temporarily cede control of the harem to another concubine. This serves as a reminder that even the most powerful figures in the harem are not invincible.

In the final chapters of the series, Yan Ruyu's name is mentioned once again as she plays a pivotal role in the resolution of the main conflict. She is shown to be a formidable opponent, but also reveals a more compassionate side as she helps Xia Yuhe navigate the complex web of relationships and politics within the harem.

Overall, Yan Ruyu is a complex and multifaceted character whose name appears frequently throughout ""Empress's Harem"". She serves as a powerful force within the imperial court, and her actions and decisions have far-reaching consequences for the other characters in the series."