The police established a mysterious organization "Shadow", which secretly collected evidence for the police and eradicated criminal leaders who were dangerous to social stability at critical moments. Based on the special nature of the work, the selected "shadows" are all the elite among the elite, and all are included in the death blacklist. Xiao Wuyu and Yu Beifan are members of the "Shadow". They infiltrated K University to complete an extremely dangerous task, and a series of thrilling and touching stories happened as a result.