The Nadutong Company where Zhang Chulan and Feng Baobao work has assigned a special mission - to escort the former precious sword "Hirumaru" to the border to fulfill a decades-old agreement with the Ishikawa family of Yingguo. Zhang Chulan and Feng Baobao will face unfamiliar teammates, the harsh winter weather in the north, and powerful enemies who are eyeing the sword. A battle to defend "Hirumaru" begins in the forest and snow.