  Flavor changing neutral current and lepton flavor violating processes are
studied in the SU(5) SUSY-GUT with right-handed neutrino supermultiplets. Using
input parameters motivated by neutrino oscillation, it is shown that the
time-dependent CP asymmetry of $b \to s \gamma$ can be as large as 20%. We also
show that the $B_s$-$\bar{B}_s$ mixing can be significantly different from the
standard model prediction.
