The Princess Royal Season 1 Episode 34

In the past, Su Rong Qing did not kill Li Rong. He gave Pei Wen Xuan a fragrance pouch to slow down the poison of Fragrant Beauty. It means Li Rong was already poisoned before she fell ill. Li Rong never expects that instead of her husband, who has opposed her for decades, and Su Rong Qing, who has a deep grudge against her, it is her brother, Li Chuan, who wants to harm her.