Jinwoo is a confident individual with a strong sense of family and a thirst for strength. As a result, he is very close to his sister, mother, and Jinho, and rarely wastes an opportunity to grow stronger. It should also be noted that despite being the strongest hunter in the world, Jinwoo is not particularly arrogant and is both polite and easygoing in-person. He is also mostly indifferent to materialistic desires such as fame and fortune and can be very selfless, as displayed when he teleported to Jeju Island without a second thought to save the Korean raid team from certain death. In battle, however, he is ruthless, slaughtering his enemies indiscriminately, and even somewhat disdainful, as displayed when he taunted the Ant King for being an insect and mocked the Architect for his flawed design of the System. In contrast, back when he was weak, Jinwoo was very timid and insecure due to his incompetence as a hunter and his troubled family situation. Although he cared deeply for his family and spent years risking his life going on raids for their sake, he was secretly ashamed of his circumstances, as displayed when he lied to Joohee about why he had picked up hunting as his job.