kpop companies don't just send their idol to japan now to promote or build their career there (not because kpop doesn't need japan but because kpop doesn't need to promote a lot in japan since a lot can get popular by just releasing kpop albums )
These are the groups that I know of DBSK , FTisland and N.flying I remember DBSK talked about their hardship in japan promoting and language barrier , culture..etc I don't remember where I read this so if I find the source I will post it, and for bands
n.flying were promoting in japan before their official debut in korea I also think because playing in japan will help them gain more experience because bands market in japan is bigger
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