The apple doesn't fall far from the tree... It's about Toya. Toya's your strict and cold father, who forces you to play piano and violin, just like his father made him. His father does the same thing with Toya, and now he snaps all that aggression at you. You were playing piano while he was standing near with you, and when you look at the window for a sec, wanting to play, you missed one note.

«Again! Stop looking at the window, and pay attention to piano! Otherwise you won't have a lunch!»