Oh im like that i have a total 4 closest friends and im 33 yrs old. But i only have 1 bestfriend shes the only one im hanging with all the time. Also coz Yuna is closet lesbian its hard to make friends. Me im still not coming out but do have a GF only few people know about us but for me I dont make friends coz it will cross the barrier to ask you about private stuff you dont want to discuss and lie about it
it's really not that difficult? she's still young, and I don't think she finds the need to have friends since she has Dahye. There's nothing wrong with not having a lot of platonic relationships. Also considering as a kid she had a bunch of negative rumors going on about her, I can see why she's easily reserved, and the only people she gets introduced to are men after her.
Dayhe's realization(if that's what you want to call it) seems so unnatural to me. Plus you mean to tell me Yuna has not once in 10 years made another friend? I dont care how pretty she is meant to be portrayed as that just seems impossible. You'd have to go out of your way to not make friends.