Fic rec request: Playing dumb

Spencer hiding his intelligence or trying to "blend into the background" (hiding himself) even if it is well known he is probably a genius people never notice him because he tries hiding himself. Or him hiding something odd for him to do like playing a sport.

Hiding can mean he just doesn't over share but doesn't really keep it a secret or him actively hiding X. Also, can be for a case or in" real life".