Mamamoo did an interview in the latest issue of Haru Hana that's been partially scanned here. They talk a little about romance, but the Twitter translation is pretty rough so I did a more thorough trans. Enjoy!
The last part, the one where Solar talks about how she acts in a relationship. "S: There are times when I’m more aggressive, but I’m generally not the type of person who shows their feelings. So that part of me is passive (laugh)". Can anyone in this thread say that it is not EXACTLY how we perceive Yong towards Byul??? More on the "my feelings are private" side, but every now and then, she makes sure to show, or maybe she can't really keep it hidden how much she cares.
This might not mean a lot to people, but to me it proves we are not as delusional as some might think. We are just paying extra close attention so we notice things others might not.
Not to mention, the need Byul feels to react to just about everything related to Yong. Specially in a situation like this, talking about something so personal and close to them.