During the reign of Emperor Hui of Han Dynasty.
In Anning County, Lin Yisu met Hao Caile for the first time and fell in love secretly. Unexpectedly, Zhao Ziqing also fell in love with Lin Yisu due to a chance encounter. Zhao Zihan, Weiyang Palace Guardsman, is Zi Qing's brother. In order to help his sister Zi Qing, he proposed to take Yi Su to Chang'an.
Caile stayed in Anning County sadly. Caile's mother, Zhang Yuhe, was the daughter of Xuanping Marquis Zhang Ao. With the help of Princess Lu Yuan, she and Caile's father fled Chang'an and came to Anning County. Later, Yuhe's younger brother Zhang Chi found Yuhe, and Yuhe asked Zhang Xi to take Caile to Chang'an to express the love between Caile and Yisu.
Caile entered the palace and unknowingly captured the heart of Emperor Hui Liu Ying. Queen Zhang Yan devoted herself to helping the two, and the queen mother Lu Fei agreed to their relationship. From falling in love with Caile to having children, Liu Ying reaped rare sweetness in her miserable life.
However, because Zhang Yan had no children, the Queen Mother asked Zhang Yan to adopt Caile's son, but Zhang Yan refused. Qu Nihou Chen Ping conspired for the Queen Mother and replaced Zhou Meiren's son. The Queen Mother agreed, but she killed Zhou Meiren after she gave birth. Caile found it difficult to accept and died of depression. Liu Ying followed him, and the Han Dynasty and his and Caile's beloved son Liu Yuan were entrusted to Zhang Yan.
When the Queen Mother came to court, conflicts between Zhang Yan and the Queen Mother continued. The Empress Dowager died, and the Liu family, the Lu family, and the ministers fought for power. Zhang Yan was willing to give everything to fulfill Liu Ying's entrustment. Zhao Zihan and his wife Chen Jiao, Lin Yisu and his wife Zhao Ziqing did their best to help Zhang Yan fulfill Liu Ying's last wish.
In contrast to the Queen Mother's firmness and cruelty, the four weak and young girls demonstrated the perfection of human nature and the kindness of women in the fierce power struggle at that time.
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