Princess Li Lizhi of Changle sets out to solve Chang'an's bitter winter crisis and unexpectedly meets the mysterious Qin Shuo. This man from another world offers her warm clothing and a wondrous mirror, and promises to teach her how to wash coal. In return, he helps her ask Li Shimin for the wasteland at Wangjia Village. Together, they face scrutiny from the emperor and empress and obstruction from the great clans, while pushing ahead with their coal-mining trials. Amid the snow and wind of Chang'an, they write a tale of tender romance and devotion to their country, full of strategies to bring warmth to winter.
