Kpop music or the kpop got famous in the 21st Century because this is the kind of music genre that has been there the world for a long time that is Korean music was first made in the year 1885, and since then, there had been several songs made in the Korean language. But in the 21st-century kpop got famous mainly due to the popular BTS band, which is from South Korea, and they are mainly focused on making pop music and even dancing in their videos and performances. To learn more, you can either visit the internet or else go on what is that song website.