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.

苏容卿告诉李蓉，身为长公主的她位高权重，新君无法容忍她的存在，而她也不会容忍一个钳制自己的新君。苏容卿之所以没有把毒杀真相告知李蓉，就是不愿看到她伤心难过，同时又揭示了一个惊天秘密，李信实际是上官雅与苏容华私通所生的孩子。肃王中毒太深，医生束手无策，皇帝紧急召见柔妃。公主府收到肃王病危消息，李蓉回想起苏容卿的警告，担忧李川内心深处的恶魔迟早会破出，终会吞噬至亲之人，悲剧重演。