Three rason Why BTS succeds around the world

The US website Reddit users analysed why BTS has so many foreign fans
They say there are three major reasons

The music they sing sounds more familiar to foreign fans than those sung by other idol groups

The songs of BTS resembles 90s traditional hiphop music
And It's difficult to find K-pop idols who can rap in English that as well as BTS members
Moreover, the music they perform blends well  in the US pop music

Second, the music video is produced based on storytelling format, which is one of the most important reasons why BTS is so popular

Reddit users said The music video shows
teenagers' worries about future career, bully problems

so that the age group of people sympathize with the music video
unlike most of other K-pop music videos that are colorful, captivating, riveting or aesthetically pleasing with appealing visual master pieces

Third, BTS actively communicate with fans with personal internet broadcast
Unlike other K-pop idol groups which persists having mysterious concept

which makes BTS seem more familiar with fans in many ways

Not just being friendly to fans, but the great performance BTS shows helps BTS get popular around the world