Honestly, I get why MC thinks there's a thing between Yoona and ML. From my perspective, Yoona isn't the female friend you would have from her personality especially as a personal friend not a group friend. She's more likely to pretend to be a friend of ML and appeal to everyone that they're couple in a form of entertainment through hinting while wanting ML to acknowledge it. Looks like a green tea btch. Even more with staying at her house sounds ambiguous enough.
Honestly, I get why MC thinks there's a thing between Yoona and ML. From my perspective, Yoona isn't the female friend you would have from her personality especially as a personal friend not a group friend. She's more likely to pretend to be a friend of ML and appeal to everyone that they're couple in a form of entertainment through hinting while wanting ML to acknowledge it. Looks like a green tea btch. Even more with staying at her house sounds ambiguous enough.