Old Guy, I'm Already Immortal, and I Still Have to Be a Social Animal.

Chen An traveled through the late Qin Dynasty and was captured by Qin Shihuang's alchemists to try the longevity pill. The elixir is finished and the person is alive, but the alchemist who refined the medicine has disappeared. The First Emperor died, the Qin Dynasty collapsed, but Chen An disappeared in the troubled times. He had witnessed the war between Chu and Han for hegemony, and he had also been drunk on the battlefield side by side with Emperor Gaozu. He had seen the grandeur of the completion of Weiyang Palace, and also watched the last breath of his old friend in Changle Palace. When Empress Lu came to court, it was he who secretly communicated with Chen Ping and Zhou Bo and decided on the strategy to kill Lu An and Liu. When the Seven Kingdoms rebelled, it was he who stuffed the rebel grain road map into Zhou Yafu's Chinese army tent. In the later years of Emperor Wu of the Han Dynasty, a witchcraft disaster occurred. It was he who snatched the emperor's great-grandson from the sea of ​​fire and saved the last trace of the Han Dynasty's blood. He had a discussion with Zhang Liang, drank with Han Xin, handed over battle reports to Wei Qing and Huo Qubing, and gently shook his head in the corner of the court when Dong Zhongshu proposed "deposing hundreds of families". Chen An is a person forgotten by four hundred years of time. He is also a person who has never forgotten that promise. "Guard this country for my brother."