Truth be told, you know the koreans copy everything from the japs, and these girl/guy groups are no exception. Might as well go for the original rather than the imitation
For one, I don't know that.
For b, often times a copy is an improvement, removing the flaws of the inferior original.
Additionally, Korean culture has influenced Japan, Japanese culture has influenced Korea. It is a two-way street. Don't forget that Japan occupied Korea, forced Koreans to take Japanese names, and tried to basically wipe out Korean culture replacing it with Japanese concepts. If the Japanese want to blame someone for Koreans copying Japan, they should blame the Japanese empire.
How can two countries in the same part of the world not have tons of competition in their industries? How can one side or the other not call the 'copy-cat' argument while knowingly fabricating copycats itself? Kimuchi is a pretty well known example, where Korea is the known origin and the Japanese version is the variant.
Arguing that one copies the other really gets you nowhere.
And in k-pop I see far more borrowed from the USA than from Japan.
Sadly, I'll likely never date a Korean because everything they want to feed me will have fish in it.