Mu Lanhua pounced—she actually became physical and hit her grandson.
Everyone in town knew that Mu Lanhua loved her grandson, but none knew that she loved herself more. If she were to choose between her grandson and herself, she was definitely centering around herself.
Why was she pampering her grandson? She was only scared that no one would take care of her when she was senile. In Mu Lanhua's olden perspective, granddaughters were mostly useless as they were like splashed water when they got married—lost to their husband's families.
Hence, she poured her heart and soul on Wei Jin. The objective was obvious. When she was older and needed someone to attend to and take care of her needs, her grandson could play the part, both financially and physically.
It was unfortunate that Wei Jin did something unacceptable to Mu Lanhua just now. He scratched her face!