Both groups suffer from middle child syndrome yet left marks on kpop that is still being felt today.
f(x) legacy is still seen and felt in Red Velvets music and Aespas aesthetic.
Miss A still has kpop trying to replicate (and failing miserably) It Girl of It Girls Suzy.
No one talks about them anymore because they were always in the Shadow of SNSD and Wonder Girls and then later Red Velvet and Twice.