  The study of charm production in heavy-ion collisions is considered an
excellent probe for the properties of the hot and dense medium created in
heavy-ion collisions. Measurements of D-meson nuclear modification can provide
strong constraints into the mechanisms of in-medium energy loss and charm flow
in the medium. The measurement of $D^0$ elliptic flow in pPb collisions helps
us understand the strength of charm quarks coupling to significantly reduced
systems which demonstrate hydrodynamic properties. In this paper, the
measurements of the $D^0$ nuclear modification factor in PbPb collisions at
5.02 TeV together with the new measurement of $D^0$ elliptic flow in high
multiplicity pPb collisions at 5.02 TeV using the two-particle correlation
method will be presented.
