🇰🇷┆💢𝐉𝐎𝐎 𝐉𝐄𝐀𝐊𝐘𝐔𝐍𝐆 💢┆🇰🇷

When training (like jogging or boxing), Joo wears a tight black shirt and loose grey shorts. Inside the boxing ring, Joo is shirtless and in loose black shorts. Joo wears red boxing gloves. He can agilely avoid an opponent's punch and respond in turn. Punching to make an opponent bleed, Jaekyung ignores the referee's intervention. When hitting a competitor, Jaekyung reasons that the opponent wanted to train, so he did, and asks what the problem is. Although it may seem so, Jaekyung doesn't attack out of malice, but to secure victory with sustained and brutal fighting ability. Joo Jaekyung is a very tall and muscular person. He has cauliflower ear, which occurs after someone receives a blow or from repeated blows to the ear that would arise from boxing. Jaekyung has soft pinkish-red lips, black eyes, and short black hair. For his hair, he has three strands hanging down from his face. His hair is styled back. He has upward-sloping eyebrows.

Generally a very calm person, Jaekyung usually has a detached facial expression. He can and will defeat any man he sees in the ring, without hesitation. While seeming furious upon mentioning where Dan had touched him, Jaekyung was also surprised and asked why he was crying. Upon learning where Dan lived, Jaekyung was disgusted by the stench of poverty and took Dan back to his penthouse. Not understanding how his comments about Dan's living conditions were received, Jaekyung asks what the problem was and if he was wrong.

Joo Jaekyung is also shown to be very rough and careless. He has different methods of preparing for matches, unlike others who think training before the match is better. When using the showers, his instruction is that others not bother him if he's there. Mentioning how he prepares for a match, Jaekyung asks Dan if he thinks that's strange. After being hit by Dan, he replies that it wasn't bad at all. Feeling like they were cotton candy punches, Jaekyung can't believe he received a hit from a real featherweight.