As a teenager, Jae-jun and his friend group bullied underdogs. Jae-jun is arrogant and insufferable. He has little respect for other people. He is sensitive about his colorblindness, and gets very angry and violent when other people call him blind. Jae-jun owns Siesta Luxury Shop and CC Golf Resort, a ritzy golf club. He remains just as arrogant and insufferable as he was in high school. Jae-jun hooks up with his friends from high school, Park Yeon-jin and Choi Hye-jeong.