  In this paper, we consider AdS$_3$ with
Comp$\grave{\mathrm{e}}$re-Song-Strominger (CSS) boundary conditions, under
which the dual field theory is warped conformal field theory (WCFT), featuring
a Virasoro-Kac-Moody algebra. We provide a holographic dual picture of the
single interval entanglement entropy in WCFT in the bulk AdS$_3$. We explicitly
show that the bulk object captures the entanglement entropy in WCFT is a
massive spinning particle's worldline that anchored on the boundary of the
interval. Given the mass and spin of the particle as functions of quantum
numbers of the twist operator in WCFT, the on-shell worldline action will match
the entanglement entropy in WCFT.
