A story that takes place during turbulent times when the Northern Song and Western Xia were at war. Six young individuals undergo training to becomes spies in order to defend their country.

During the reign of Emperor Ren Zong of Song, the prosperous glimmer of Northern Song is clouded by looming danger. Spies have infiltrated the capital to gather intelligence and to weaken the political clout of the imperial family. In order to end the war, a group of young heroes undergo rigorous selection and training. Yuan Zhong Xin is crafty and intelligent. Zhao Jian is beautiful and astute. Xiao Jing is against killing all forms of life. Wang Kuan is someone who never lies. Xue Yang is a man who keeps to himself. Wei Wei Nei has a liking for beautiful women. Despite their disparate backgrounds and personalities, the six begin to grow as a team through numerous life and death missions.