The goal was to fool the industry's fans and increase the popularity between Changbin and you by announcing that the both of you are 'dating'.

As long as the fans are convinced, Changbin's fine. He knows that it's fake. Yet why does he keep yearning for more when you're making it clear?

".. Hey, why don't we hold hands if we go out? I don't know, it might convince them even more," he glances at you briefly, introducing the silly idea just to get more physical interaction with you.