  Lenticular galaxies (S0s) were considered mainly as passive evolved spirals
due to environmental effects for a long time; however, most S0s in the field
cannot fit into this common scenario. In this work, we study one special case,
SDSS J120237.07+642235.3 (PGC 38025), a star-forming field S0 galaxy with an
off-nuclear blue core. We present optical integral field spectroscopic (IFS)
observation with the 3.5 meter telescope at Calar Alto (CAHA) Observatory, and
high-resolution millimeter observation with the NOrthern Extended Millimeter
Array (NOEMA). We estimated the star formation rate (SFR = 0.446 $M_\odot
yr^{-1}$) and gaseous metallicity (12 + log(O/H) = 8.42) for PGC 38025, which
follows the star formation main sequence and stellar mass - metallicity
relation. We found that the ionized gas and cold molecular gas in PGC 38025
show the same spatial distribution and kinematics, whilst rotating misaligned
with stellar component. The off-nuclear blue core is locating at the same
redshift as PGC 38025 and its optical spectrum suggest it is \rm H\,{\sc ii}
region. We suggest that the star formation in PGC 38025 is triggered by a
gas-rich minor merger, and the off-nuclear blue core might be a local
star-formation happened during the accretion/merger process.
