"Spending over 100,000yen to watch K-pop concert"... revival of Korean Wave 

The percentage of teenagers and those in their 20s visiting KCON Japan amounted to 20 percent and 37 percent, respectively. CJ E&M said, "At this year's event, the percentage of teenagers and people in their 20s seems to have increased significantly." In fact, the number of audiences who were around same age as idol singers was overwhelming at the event. This trend is changing as K-pop spreads through the Internet. As the consumers of the Korean Wave have moved into their teens and twenties, and as a type of culture that is used around the world, the culture of enjoying it regardless of Korea-Japan relations or political situations is gaining momentum. The number of performances performed by the three major Korean entertainment companies (SM, YG, and JYP) doubled to 273 last year.

https://www.mk.co.kr/news/culture/view/2018/04/240115/