Wang Yifeng, a young man from the modern era, unexpectedly arrives in the third year of the Zhenguan era, only to discover that he can stay in Chang'an for just twenty days.
To secure a foothold during that time, he uses the modern goods he brought with him to set up shop among the common folk.
Refined snow-white salt, soap, matches, water-purification tablets, drought-resistant wheat seeds, and other goods gradually transform the lives of the people around him.
As he learns about everyday life in the Tang Dynasty, he also helps disaster victims, orphans and widows, and impoverished villagers.
As his business takes off, he attracts plenty of attention and gets caught up in conflicts between Western Market merchants, manor stewards, and local power brokers.
With only twenty days, Wang Yifeng must save as many people as he can in his own way before he leaves, while also fighting to secure a chance to survive.
