+1 star for Mob A (and Mob B). It's just as the story says, no need for words. The same applies to the friend who noticed that the 2 MCs are going out without them telling anyone, and he just supports them as much as he could without revealing it so as not to make them uncomfortable. Then there's also Mob B who noticed something. He's not as sharp as Mob A, but I love a true friend who worries about his friends. They also noticed the fake smile but didn't bother changing it directly, which is both bad and good, because they understand that he must've some reason for it.
Eyes speak more love than the mouth