Simplify the following text for a Grade 7 native English-speaking person.
Original: Fan fiction , ... known to aficionados as `` fanfic '' , is non-commercial fiction created by fans in the setting of an established book , film , or television series .
Simplified: Fan fiction is non-commercial fiction created by people who love an SF story or world . Fans write stories that take place in the setting of an established book , film , or television series .