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The hybridization of magnetism and superconductivity has been an intriguingplayground for correlated electron systems, hosting various novel physicalphenomena. Usually, localized d- or f-electrons are central to magnetism. Inthis study, by placing a PTCDA (3,4,9,10-perylene tetracarboxylic dianhydride)molecular monolayer on ultra-thin Pb films, we built a hybridmagnetism/superconductivity (M/SC) system consisting of only sp electroniclevels. The magnetic moments reside in the unpaired molecular orbitaloriginating from interfacial charge-transfers. We reported distinctivetunneling spectroscopic features of such a Kondo screened pi-electron impuritylattice on a superconductor in the regime of TK>>delta suggesting the formationof a two-dimensional bound states band. Moreover, moir\'e superlattices withtunable twist angle and the quantum confinement in the ultra-thin Pb filmsprovide easy and flexible implementations to tune the interplay between theKondo physics and the superconductivity, which are rarely present in M/SChybrid systems.

PTCDA molecular monolayer on Pb thin films: An unusual {\pi}-electron Kondo system and its interplay with a quantum-confined superconductor