Cello was a story about a woman who play Cello but she was not a very good one.
So she envy her friend who always got appraisal from others .
Because of that she had killed her friend and the ghost of her friend come to haunt her and her family
by killing her family one by one...
Moral of the story :
The jealousy will not going to get you anywhere.
Try to accept the fact that there were other people who are more talented than us,,