  Hyper-Kamiokande (Hyper-K) succeeds the very successful Super-K experiment
and will consist of a large detector filled with 260~kton purified water and
equipped with 40\% photo-coverage. Physics program of Hyper-K is broad,
covering from particle physics to astrophysics and astronomy. The Hyper-K
1$^{st}$ detector will be built in Japan, and the 2$^{nd}$ detector is
considered to be built in Korea because locating the 2$^{nd}$ detector in Korea
improves physics sensitivities in most cases thanks to the longer baseline
($\sim$1,100~km) and larger overburden ($\sim$1,000~m) for Korean candidate
sites. In this talk, we present overview and physics potentials of the Hyper-K
2$^{nd}$ detector in Korea.
