Okie dokes

It's just 넹 instead of 네.
Some childish way to say. You know, there's some girls who talk with the sound of (to me it's like nail on the board), oppa, 사랑행, 귀요워용. That kind of talking style.

ohhhh ok i was literally thinking it was similar to molla/mollang but wasnt sure what word they were using to -ng/-ㅇ

Yep. That -ng sound.