Do Taegyosil

On Yu-I, a boy who is falsely accused of stalking a female student in the same class, becomes an outcast. A beautiful transfer student named Yu Mi-So visits his hellish daily life. The perpetrators who initially harbored ill intentions toward her and then later developed a grudge against her threaten On Yu-I, the outcast, and order him to stalk Mi-So.

(Source: Namu, translated, edited)