Signed, Sealed, Mistaken (Uncensored)

Alternative:

재수학원 / Private Academy / 浪人学院 / 最后的冲刺 / 衝刺重考班 / Jaesuhagwon , Mauvais Destinataire , Dubiose Lieferung , Prof. Climax , Entrega Duvidosa , Destinario equivocado

A fateful mix-up brings an unexpected twist to a student’s life at a cram school. When a mysterious package meant for his star lecturer, who shares his name, lands in his hands, an unusual relationship begins to unfold between them—one that blurs the lines between student and teacher.