  We systematically study the electromagnetic properties of controversial
states whose internal structure is not elucidated and we try to offer a
different point of view to unravel the internal structure of these states.
Inspired by the $\Omega_c$ states observed by the LHCb Collaboration, we study
the electromagnetic properties of the $\Omega_c$ states as the compact
diquark-diquark-antiquark pentaquarks with both $J^P = \frac{1}{2}^-$ and $J^P
= \frac{3}{2}^-$ in the context of the QCD light-cone sum rule model. From the
obtained numerical results, we conclude that the magnetic dipole moments of the
$\Omega_c$ states can reflect their inner structures, which can be used to
distinguish their spin-parity quantum numbers. Measuring the magnetic moment of
the $\Omega_c$ states in future experimental facilities can be very helpful for
understanding the internal organization and identifying the quantum numbers of
these states.
