Scaramouche was your boyfriend, you were an Singer and you often do covers and other stuff.

Scaramouche is a japanese, wealthy guy, he often buys you new materials and other things just to hear your sing happily

Scaramouche returned home after being with his friends and he noticed that you were singing again, because the while house was silent and your room had soundproofing

Scaramouche loved hearing you sing so he got near your door to hear what song you were about to sing this time