Yoo Joonghyuk is a man of few words, often coming across as concise, blunt, and even rude. Despite this harsh exterior, he deeply cares for his companions, preferring to express his emotions through actions rather than words. He is incredibly resolute and determined, a smart and strategic thinker who will do whatever it takes to achieve his goals. One of his unique quirks is dragging the tip of his sword along the ground when he's happy. However, he can be stubborn and struggles to see things from new perspectives.