  In this article, we take the point of view that the charmed scalar meson
$D_{s0}(2317)$ is the conventional $c\bar{s}$ meson and calculate the strong
coupling constant $g_{D_{s0} D K}$ within the framework of the light-cone QCD
sum rules approach. The numerical values for the large scalar-$DK$ coupling
constant $g_{D_{s0} D K}$ support the hadronic dressing mechanism. Just like
the scalar mesons $f_0(980)$ and $a_0(980)$, the $D_{s0}(2317)$ may have small
scalar $c\bar{s}$ kernel of the typical $c\bar{s}$ meson size. The strong
coupling to the hadronic channels (or the virtual mesons loops) may result in
smaller mass than the conventional scalar $c\bar{s}$ meson in the constituent
quark models, and enrich the pure $c\bar{s}$ state with other components. The
$D_{s0}(2317)$ may spend part (or most part) of its lifetime as virtual $ D K $
state.
