Su Weiyang, a graduate student in the Department of History, traveled through the Tang Dynasty and became a young man fleeing from chaos in troubled times - and he also picked up a body that will neither age nor die. He didn't dare to be auspicious, so he only dared to set up a stall in the West Market and sell cakes honestly. But his cakes were so delicious: the King of Qin came to eat them in disguise, and Wei Zheng visited them every day. Even the new emperor himself boasted that "the fireworks in the market are valuable because they last forever." In the darkness, Wangxianlou, who has been searching for the "seed of immortality" for thirty years, is opening a net towards him; a girl named "Moon" also breaks into his endless life. From Wude to Tianyou, people in Chang'an City have aged one after another. He is the only one who is still standing at the entrance of Xishikou, leaving a mouthful of warmth for those who cannot come back.
