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In the fourth year of Emperor Dezong's reign in the Tang Dynasty, there was an undercurrent surging under the calm appearance of the capital. Wei Shaozi, a prodigal son, was inadvertently involved in a conspiracy. With the help of the local girl Duguying, he gradually learned about the changes in Tubo, Uighur and other forces, as well as the struggle between the feudal town and the court. He was forced to fluctuate with the times, but he found that everything in front of him was inextricably linked to his deceased father. After fleeing from the capital to Jingyuan, he experienced the Jingyuan mutiny. The rebels led by Zhu Si seized Chang'an, and the Tang Dynasty was in danger. Witnessing the difficult times, he resolutely chose to seek refuge with Duan Xiushi, an important official in the imperial court, hoping to reverse the situation with his own meager efforts.

Sheng Guanghui, a young man who walked out of a forest farm deep in the mountains, and his childhood friend Xia Yiran met by chance in the provincial capital. This meeting reminded them of their childhood experiences together. Xia Yiran's mother, Chen Zhihua, is a mentally ill patient, and her father is missing. When she went home to visit her grandma and mother during the summer vacation, she accidentally learned some internal stories of the family. She found her uncle and grandma, who was an eyewitness to the incident, and found out that her mother had been insulted by her grandfather Xia Laowei in the forest farm, and then her grandfather asked her father to marry her to settle the matter. With the help of Sheng Guanghui, Xia Yiran finally recalled the scene when he witnessed his mother being unable to bear the domestic violence and accidentally smashing her father to death with a can. In the process of solving this series of mysteries, she further discovered the truth behind her mother's madness thirty years ago.