Why South Korea again wants nukes of its own

It has been reported that Seoul may be looking into reviving its own nuclear program as Pyongyang has made no bones about the possibility of nuking the United States and its allies after it detonated a hydrogen bomb in September.

If South Korea is able to come up with its own H-bombs, then the security implications for China would be far more complex than the controversial installation of the US-supplied Terminal High Altitude Area Defense (THAAD) system, Chinese military commentators have warned, pointing out that northern and northeastern China, including Beijing, might be well within the range of South Korean missiles equipped with nuclear warheads.