Comment by Marilyn on Blossoms of the White Night - Chapter 18

@Marilyn the author gave a really good explanation why they don't speak out their thouhgts:

"Silly Baekya TMI... Tae's personality is quiet and he doesn't talk much. It's because of his status as a noble. As a noble, every word he says could hide meaning, so he has to be careful. Especially since Tae is a total T, he's a bit weaker at wrapping his words compared to other nobles. That's why he's even more reserved, they say... On the other hand, Shuraka finds conversations with others a bit tricky due to surrounding environmental factors... For that, please check out Shuraka's backstory, which will gradually be revealed later! Haha! I know everyone's getting frustrated and telling Tae and Shuraka to just talk already... ^//^)> It'll all work out fine!" @busy_bwthell on twitter 😆