Yu has a startlingly emotionless and disinterested persona, taking little to no interest in anything other than his pet cat. He is shown to be alarmingly apathetic, simply taking hits because he couldn't be bothered to dodge them[1] and giving zero response when threatened by an obviously vicious person.[2] However, after his encounter with K and then seeing Injae trying to fight Ryu Baeksan, he gains an interest in boxing after asking whether hitting people was fun. He seems to not understand