Although the two sisters could already feel some barriers, due to Du You's influence, these barriers were not too obstructive, often appearing briefly before disappearing quickly.
However, the feeling was not false. Du You finally understood why some people were unable to make any progress after reaching a certain level—it was because of such barriers. When the obstacle becomes great enough, progress becomes impossible.
That feeling would probably be incredibly despairing. Getting used to rapid advancement, and then suddenly stagnating, would be quite unsettling. Well, Du You merely felt a bit emotional and did not consider it too deeply.
