  Structures in the Universe are arranged into the cosmic web. Distributions,
statistics, and evolutions of the structures can be used as probes for
cosmological models. We investigate the number density of voids and dark matter
halos-in-voids in the Excursion Set Theory (EST). We study the Markov and
non-Markov frameworks of EST in both spherical and ellipsoidal collapse models.
Afterward, we compare the number density of voids and halos-in-voids in the
standard $\Lambda$CDM and the reconstructed model. The reconstructed model is a
model-independent reconstruction based on background observations. This work
explores the effects of the collapse model barrier in the different EST
frameworks on the statistics of voids and the statistics of halos-in-voids.
Finally, we find the hint that cosmological models can be distinguished by the
number density of halos-in-voids in the $1.0-2.5$ redshift range. The maximum
difference is observed in $z\sim1.9$.
