It could be a tear jerker if it's like a happy sad.

如果是喜极而泣的话，也可以叫做催泪弹。

And then a jerker, so jerk means to pull, right?

而猛拉，指的是拉，明白吗？

So a tear jerker is a book that pulls your tears out.

所以催泪弹指的是让你流下眼泪的书。