@Yanagi Nah, the thing about Yoona is that she gets very attached to people and values her friendships a lot. She herself confirmed she is not interested in our pink haired MC when Rose herself confronted her about it (and she misunderstood Yoona, giving us the glorious door scene lmfao).
However its been hinted her and blondy here are probably going to end up together. At least the later confirmed she liked Yoona when she saw her profile on the dating site (And she probably would still like her on a normal situation If it weren't for the fact Yoona is awkward about being more open about her sexuality).
Anyways, seems like things will start rough and will develop between the two.