  Microlensing planets occurring on faint source stars can escape detection due
to their weak signals. Occasionally, detections of such planets are not
reported due to the difficulty of extracting high-profile scientific issues on
the detected planets. For the solid demographic census of microlensing
planetary systems based on a complete sample, we investigate the microlensing
data obtained in the 2016 and 2017 seasons to search for planetary signals in
faint-source lensing events. From this investigation, we find four unpublished
microlensing planets including KMT-2016-BLG-2364Lb, KMT-2016-BLG-2397Lb,
OGLE-2017-BLG-0604Lb, and OGLE-2017-BLG-1375Lb. We analyze the observed lensing
light curves and determine their lensing parameters. From Bayesian analyses
conducted with the constraints from the measured parameters, it is found that
the masses of the hosts and planets are in the ranges $0.50\lesssim M_{\rm
host}/M_\odot\lesssim 0.85$ and $0.5 \lesssim M_{\rm p}/M_{\rm J}\lesssim
13.2$, respectively, indicating that all planets are giant planets around host
stars with subsolar masses. The lenses are located in the distance range of
$3.8 \lesssim \dl/{\rm kpc}\lesssim 6.4$. It is found that the lenses of
OGLE-2017-BLG-0604 and OGLE-2017-BLG-1375 are likely to be in the Galactic
disk.
