I found it fascinating, because.. i thought that its about fact of talking with people. What i mean with that, almost all stutterers don't have problem, when they're talkin alone right ? So it's ( like i said, in most cases ) about people and talking with people in general. because of untreated stutter or traumatic moment, so we unconsciously feel fear and we know that slutter will come. So, logically.. language doesn't matter, people like people, but... that's it. Learning a new language is like learning how to speak from 0. Of course... like i said, lot of people do slutter in whatever language they learnt, but less or more, depends on language and Asian languages are more sounding ( not Japanese ) Chinese and stuff, Korean is not sounding language, but its fluent and slick language.. tha'ts maybe reason, why i do not slutter in Korean. My native language is Czech, like i said and its really, really hard to pronounce,( for foreigners ) sometimes even for natives. So it's something really different - Slavic/Asian language, so maybe, i don't feel scared and stuff ( unconsciously ) because u can stretch it or whatever, unlike Czech, so i feel more comfortable and thus i do not slutter, even when i am talking with a people. But it depends on person to person i guess, i actually found this. http://blog.thedarren.com/2015/06/stuttering-in-korea.html