https://www.youtube.com/watch?v=U_QMS-hzRMs

https://www.youtube.com/watch?v=KLqyKeMQfmY

https://www.youtube.com/watch?v=8ch_H8pt9M8

https://www.youtube.com/watch?v=u7zLNBtHTdc

https://www.youtube.com/watch?v=rfr6YO-zLZc

I have provided afew educational videos here, and I hope you watch them all

just to get a better understanding of how Tadoma works,

and the progress people can make wit their speech while using it. 

I think it will alsogive you a better idea as to how Jongin communicates

in the story and as well as how his speech would sound.