Do I have to fill the corner on each floor?

Is the drop of sweater the same as the filling angle?

The answer is yes. For round-shouldered sweaters knitted from top to bottom, the drop is the same as the corner filling. Corner filling is to fill a water drop in the back of the garment by pulling back. This water drop is corner filling. This corner filling position just fills the arc of the circular surface with a straight line, which just fills the armpit point. So the gap between the back and the back is angle compensation.