C120 Old Man's Identity

Deep in the night, the teacher's dormitory was abnormally quiet. However, in the middle of the quiet night, a thin and short figure suddenly appeared downstairs. The figure quickly scurried up the stairs like a leopard cat and arrived on the fifth floor in the blink of an eye.

Yu Xin had been tossing and turning in his bed for a long time, but he hadn't fallen asleep at all