Accents are completely different from voice ( tones) even though in order to use different accents your tone generally slightly change. In the episode where Mudeok first went to Jang residence. (Ep1)The thinking voice are 2 different voices. When she first met Maidservant Kim after the talk and she went outside, she thought. ‘The young master? Why would he bring me hear?’ Sounds nothing like Go Youn Jung.
In the bath tub tornado scene Go youn Jung voice is clear. I don’t dispute that Gyj done voice overs but I don’t think it was done for every single scene where It was a thought process. Tbh I don’t even know why I even shared my thoughts on this topic because I honestly don’t care who’s voice it was, I like both actresses in this particular series so the thinking voice isn’t really relevant as it’s clear that it’s Naksu inside the body since she performed The AOS..
It was a misunderstanding when I also said abou JSM lied about voice because the person above clearly said Accent,which as I said before is a different thing
Perhaps I’m the wrong that’s wrong and GYJ used different voices but I hear 2 different undertones . My bad I guess ??