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During the Yongping period of the Eastern Han Dynasty, Liu Chen and Ruan Zhao went to Tiantai Mountain to collect medicine. Because of the lost encounter with two daughters and then married. Half a year later, when he missed his hometown, he was already a man, and his grandson had passed it on to the seventh generation. Only then did he realize that he had encountered a fairy, a fairy for half a year, and hundreds of years in the human world.
The two returned to the rooftop to renew their relationship, but they could no longer find it. Liu Yuxi's "former degree Liu Lang is here again" is to use this allusion to come from the situation at that time.
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Former Liu Lang, described as a person who returned again after leaving.