  We consider a simple extension of the Standard Model with a scalar top-philic
Dark Matter (DM) $S$ coupling, apart from the Higgs portal, exclusively to the
right-handed top quark $t_R$ and a colored vector-like top partner $T$ with a
Yukawa coupling $y_{ST}$ which we call the topVL portal. When the Higgs portal
is closed and $y_{ST}$ is perturbative $ (\lesssim 1)$, $TS\to (W^+b, gt)$,
$SS\to t\bar{t}$ and $T\bar{T}\to (q\bar{q},gg)$ provide the dominant
(co)annihilation contributions to obtain $\Omega_{\rm DM} h^2\simeq 0.12$ in
light, medium and heavy DM mass range, respectively. However, large
$y_{ST}\sim\mathcal{O}(10)$ can make $SS\to gg$ dominate via the loop-induced
coupling $C_{SSgg}$ in the $m_S<m_t$ region. In this model it is the $C_{SSgg}$
coupling that generates DM-nucleon scattering in the direct detection, which
can be large and simply determined by $\Omega_{\rm DM} h^2\simeq 0.12$ when
$SS\to gg$ dominates the DM annihilation. The current LUX results can exclude
the $SS\to gg$ dominating scenario and XENON-1T experiment may further test
$y_{ST}\gtrsim 1$, and $0.5\lesssim y_{ST}\lesssim 1$ may be covered in the
future LUX-ZP experiment. The current indirect detection results from Fermi
gamma-ray observations can also exclude the $SS\to gg$ dominating scenario and
are sensitive to the heavy DM mass region, of which the improved sensitivity by
one order will push DM mass to be above 400, 600, 1000 GeV for $y_{ST}=0.3,
0.5, 1.0$, respectively. $T\bar{T}$ pair produced at the hadron collider will
decay $100\%$ into $t\bar{t}+E^{miss}_T$ signal when kinematically open. The
latest ATLAS 13 TeV 13.2 $\mathrm{fb^{-1}}$ data can excluded $m_T$ between 300
(650) and 1150 (1100) GeV for $m_S$ =40 (400) GeV and the exclusion region can
reach up to $m_S\sim 500$ GeV.
