TNK has their website & Facebook.
So we want to know more about them.
Thanks to Panda & Mei who discovered them!
TNK website : http://www.tnkmusic.com/
TNK FB : https://www.facebook.com/Tnkmusic/
This is Park Si Hoo's vocal instructor : 헌수연 : Han Su Yeon
Park Si Hoo and the others at TNK
Picture of all instructors in this academy
Credit : TNH Music Academy, thank you!