  Evolutionary pathways of binary systems are vastly different from single
stellar evolution, and thus, there is a need to quantify their frequency and
diversity. Open clusters are the best test-bed to unveil the secrets of binary
populations due to their coeval nature. And the availability of
multi-wavelength data in recent years has been critical in characterising the
binary population. NGC 752 is a solar metallicity, intermediate-age open
cluster located at 460 pc. In this work, we aim to identify the optically
subluminous white dwarfs in NGC 752 and identify the illusive blue lurkers by
association. We used multiwavelength photometry from Astrosat/UVIT, swift/UVOT,
Gaia DR3 and other archival surveys to analyse the colour-magnitude diagrams
and spectral energy distributions of 37 cluster members. We detected eight
white dwarfs as companions to cluster members. Four of the systems are main
sequence stars with extremely low mass white dwarfs as their companions. Two
are these main sequence stars are also fast rotators. The presence of low mass
white dwarfs and high rotation signals a past mass transfer, and we classified
the four main sequence stars as blue lurkers. The binary fraction in NGC 752
was estimated to be 50--70%, and it shows that the contribution of optically
undetected stars is crucial in quantifying the present-day binary fraction.
