As usual, not very far. So, j-pop took the idea if the swueaky ckean pop group boyband, set it to the extreme, so idols need to play characters on stage, off stage, in their actual lives, etc. Then they took the music, added the faintest whiff of hip hop and edm, and that's J-pop. Then Korea said "hey, japan has a thriving music industry that includes international markets. Lets do that, so our shitty market stops crumbling" so they did, but k-pop includes a racism towards mixed race idols, while japan loves mixed race idols. The only people who likek-pop are americans who see squinty eyes and moisten their panties.