He didn't study for a couple of months.He studied for 10 years.Long enough to learn a language.This is a fbpage of nz kp0p fans that lists all kp0p idols who are related to nz.This is from the people who are from nz,so,the ground report.
https://www.facebook.com/media/set/?set=a.306031656076809.83570.220577457955563&type=1
And their oldest member is an exchange student in australia.He is fluent in english as well.But,chooses to act ignorant just to appeal to the fans.
And yes,learning a language by oneself is not a big deal.I learned two by myself in the past few months and am on the way to learn two more.
And it is also true that many geniuses are socially awkward.
But the grouse is that his description and behaviour somehow doesn't seem to gel well.And many feel it odd,intuitively.That gut instinct.
The whole kp0p act,irrespective of the group, is well,only an act.They put on a show with pre-scripted characters and present other content for money,fame and to spread the propaganda of their higher-ups.