A reptilian from the Water Sect, Kong Yonghyeon is small in stature and babyfaced - a comment he hates, doing all he can to appear older. He acts tough and straight to the point, with a strong sense of justice. Still, he uses his sense of responsibility and duty to cover up his soft heart. He hates the Insect Tribe and humans.

Close friends with Arbiter Maeok’s daughter Soohyeon since childhood, they often get locked in friendly competition. Although he’s never beat her in anything and sees her as his arch-rival, he’ll still jump forward to protect her from even the slightest sign of danger. Sometimes he doesn’t understand what she’s thinking and tries too hard to play it cool, ending up saying something awkward instead. Soohyeon truly occupies a large space in Yonghyeon’s heart.