  In this note, we discuss the bulk reconstruction of massless free fields in
flat space from the highest-weight representation of boundary Carrollian
conformal field theory (CCFT). We expand the bulk field as a sum of infinite
descendants of a primary state defined in the boundary CCFT, and discuss the
Lorentz invariant bulk-boundary propagator in detail for the BMS_3/CCFT_2 case.
In our calculation, it is necessary to introduce a nonzero mass at the
beginning and take it as vanishing at the end. The framework we proposed has
the potential to probe local bulk physics from the boundary CCFT.
