Hyunbae, of course, was the responsible for Dami's appearance at the dance competition. Jiyong had only told him about it, seeing as his younger brother was competing in the actual competition, but he knew it was an opportunity that Dami wouldn't want to pass up when it came to torturing supporting their younger siblings.
That, and it was always amusing to watch the way that Jiyong and Dami interacted, not to mention when you added Youngbae to the mix.
When his younger brother walked out on the stage, he was proud to say that he noticed an air of confidence behind that shy smile, standing with Dami and circling his hands around his mouth to shout his encouragements to his brother. He yelled, whistled, and generally made the usual excited noises that came from a person when you were cheering someone on.