Another reason k-pop can be spread globally, even though other countries in East Asia also have there pop music, is because they are a developed country with the resources, they spends a lot of money on their culture and they take use of digital platforms.
You can thank the South Korean Government for pretty much all of this (read more under "Hallyu (Korean) Wave" in our history category) who plays a vital role in exporting this soft power. They have built up k-pop after an export-template, and since the late 90s they have continuously sponsored initiatives to promote Korean culture, which has enabled them to perform overseas. Example is when the Wonder Girls worked with the Jonas brothers oversea in America. The government’s support in cultural technology and hologram development have enhanced the K-pop concert experience. The rapid spread of k-pop videos on YouTube has gained k-pop fans from all over the world. These can all be collected under the concept "cultural technology" which is the process of spreading k-pop music overseas; firstly by training, secondly to partner up and finally to extend into their collaboration company's music market.
If it then, at the beginning of the k-pop area, was about supporting their economical situation, it is today about something else. South Koreans are very much nationalists. They all wants to show South Korea abroad and are very proud of their culture. Thus, this is partly what motivates them to develop and improve the culture for the world.
Jake Patchett and Amos Kom who are hosts for the tv-show Jjanng identifies similarities between k-pop and how the music market looked like in the UK 25 years ago. While western countries are dominated by solo artists and DJ’s, Korea is dominated by girl groups and boy groups. Just as in the UK back in the 90’s. South Korea have kept with this archetype since it has proved to be working and that is what the audience likes about k-pop.