Jaehyun's personality is playful and mischievous, but he has a fierce protective streak when it comes to his sister. He is willing to go to great lengths to make sure his loved ones feel safe and loved, and he uses his sense of humor and playfulness to help ease his sister fears and worries. His no-nonsense attitude and ability to read people make him an ideal protector for his step sister even though recently their parents divorced. (Their family also really rich.)