i have found that it only ever asked me to do that when i was on my iphone when i added the korean keyboard. i have an on-screen korean keyboard on my laptop yet it doesn't ask for me to type in hangul on my laptop, so i'm not sure how the system is set up.
예 could be used in formal situations, but it typically isn't used as it comes off as a little too awkward and stiff. 네, even though used in informal speech is usually used in formal speech as well since it sounds more natural
Whenever the woman says 네, I hear kind of a nasalic sound. I watch a Kdrama (Romance is a Bonus Book) and the main character says it kind of like a nasalic n with a d sound a bit? I don't know if it's just me..
But Is it necessary to make it sounds like that?