  The hybridization of magnetism and superconductivity has been an intriguing
playground for correlated electron systems, hosting various novel physics.
Usually, localized d- or f-electrons are central to magnetism. In this study,
by placing a PTCDA (3,4,9,10-perylene tetracarboxylic dianhydride) molecular
monolayer on ultra-thin Pb films, we built a hybrid magnetism/superconductivity
(M/SC) system consisting of only sp electronic levels participating in the
magnetic and superconducting (SC) states. Through experimental and theoretical
investigations, we found that the magnetic moments originating from interfacial
charge-transfers reside in the unpaired molecular orbital. Kondo screening and
its interplay with the superconductivity show several striking spectroscopic
features in scanning tunneling spectroscopy measurements that illustrate the
distinctiveness of delocalized {\pi}-electron magnetic moments with substantial
lateral coupling. Moreover, moir\'e superlattices with tunable commensurate
twist angle and the quantum confinement in the ultra-thin Pb films provide easy
and flexible implementations to tune the magnetic moment concentration, the SC
order parameters, and the competition between them, which are rarely present in
previous studied M/SC hybrid systems.
