What is the meaning of 捅破 the serial of 寒夜? E.g. 被我们的学生捅破
捅破 comes from 捅破窗户纸 (poke the window paper). Try googling "捅破窗户纸".

In the past, Chinese used paper instead of glass on their windows until the technology of making glass is imported to China. Window paper can stop the wind, but is much more fragile than glass and can be easily poked. Window paper is not transparent. If you poke a hole on it, you can see the other side.

The two people loved each other, but they are too shy to tell each other. That's like there is a thin piece of paper hiding them from each other. Once it is poked, they can see each other. That is, they know how the other person feels.

捅破窗户纸 is also similar to "break the ice" in English.