  In this talk, we summarize our recent works on the tetraquark mixing
framework for the two light-meson nonets in the $J^{PC} = 0^{++}$ channel, the
light nonet [$a_0(980)$, $K_0^*(700)$, $f_0(500)$, $f_0(980)$] and the heavy
nonet [$a_0(1450)$, $K_0^*(1430)$, $f_0(1370)$, $f_0(1500)$]. We briefly
explain this mixing framework and present various phenomenological signatures
to support this picture.
