  Recently, the discovery of a Venus-mass planet orbiting a brown-dwarf host in
a binary system was reported from the analysis of the microlensing event
OGLE-2013-BLG-0723. We reanalyze the event considering the possibility of other
interpretations. From this, we find a new solution where the lens is composed
of 2 bodies in contrast to the 3-body solution of the previous analysis. The
new solution better explains the observed light curve than the previous
solution with $\Delta\chi^2\sim 202$, suggesting that the new solution is a
correct model for the event. From the estimation of the physical parameters
based on the new interpretation, we find that the lens system is composed of
two low-mass stars with $\sim 0.2\ M_\odot$ and $\sim 0.1\ M_\odot$ and located
at a distance $\sim 3$ kpc. The fact that the physical parameters correspond to
those of the most common lens population located at a distance with a large
lensing probability further supports the likelihood of the new interpretation.
Considering that two dramatically different solutions can approximately explain
the observed light curve, the event suggests the need of carefully testing all
possible lens-system geometries.
