Hajun Gu

Throughout the series, it's mentioned or at least hinted that Hajun is attractive. Once, a girl asked for his number during a trip to the beach.

He has dark brown hair and a muscular complexion thanks to his training. He is also quite tall. Throughout the series, Hajun primarily wears black when not in uniform, and sometimes white and dark blue. He started wearing a trench coat during the assault on North Gangbuk High School.

Personality
According to Daniel, Hajun was selfish and arrogant in middle school [2], and nothing changed until the events of the series begin. After Hajun lost to Suhyeon and skipped school for a while, the other students were relieved to have a break and hoped that he wouldn't return. However, once Hajun returned, he slowly started to admire Suhyeon and loosen up. Overall, Hajun has always been a loner, and this has generally stayed the same, though he does occasionally open up a little to his crewmates.

Hajun takes an official stance and distances himself from the personality traits Daniel attributes to him by continuing to fight—stopping Daniel from pursuing Suhyeon—and proclaiming Suhyeon a good leader who will unify Gangbuk. Hajun specifically highlights Suhyeon's lack of judgment and objectification, as well as his openness and honesty, indicating that these are traits he truly values ​​now—a stark contrast to the Hajun Daniel and early readers knew.