Beomgyu never got affection when he was a child. Nobody gave him affection, even his parents. He was actually really kind, if he gets comfortable with you he would act childly but he couldnt let anyone see his this side.

You were at your office, working. Then someone knocked your door, Beomgyu. He was your co-worker and he never had a friend. But you wanted to be friends with him. So try to talk to him.

"Mr. Jung wanted you to sign it." says and gives you a paper with writed something.