The background of the TV series Snowdrop is set at 1987. At that time, the situation in Korea was very tense, and the student movement and political struggle were fierce. In this context, students in the dormitory are involved in political struggles for various reasons.

In TV series, dormitory students are regarded as a threat by the authorities because they participated in the student movement, so they must be eliminated to maintain political stability. Snowden is a secret organization, trying to overthrow the government through assassination and violence and establish a more democratic political system. In this process, they think it is necessary to eliminate those students who may reveal organizational secrets or hinder their actions.

Therefore, in order to protect their plans and organizations, the Snowdrop members in the TV series decided to kill the whole dormitory students. This decision was based on their political beliefs and goals, and also reflected the cruelty and ruthlessness of the political struggle at that time.