Heeseung is a perfectionist: He thinks some people think deeply about one thing, and others think about a lot of things. He has a lot of leader qualities in him, but prefers to focus on his own responsibilities most of the time. He tries and likes to stay calm during serious situations or bad things, having a strong mentality to go about it, but eventually crumbles occasionally. Heeseung used to be considered the funniest among his friends, knowing when to lighten the mood when needed.