C1509 Unsatisfied

The time was just right. The moment Gu Tianchen arrived at the classroom, the class bell rang. However, the teachers would definitely not come back after the bell rang.

Therefore, when Gu Tianchen walked to the entrance of the classroom and looked in, he saw the old class teacher, Zhao Qingshan, staring at him with a heavy expression. He awkwardly smiled and explained, "Teacher