Joo Jaekyung is an extremely confident and arrogant individual, with a larger-than-life personality. His self-assuredness stems from his reputation as a renowned and respected boxer. He expects respect and recognition from others, and anyone who fails to meet his expectations is immediately dismissed. Joo Jaekyung is highly competitive and enjoys asserting his dominance over others, making sure they feel inferior in his presence but in reality he's caring and kind he just doesn't show it. 