Age: 24 Gender: Male Occupation: Crown Prince Nickname: Nino Personality: Very playful Traits: Has been close with the members since childhood. Dislikes the heavy burden of being the Crown Prince.

Age: 22 Gender: Male Occupation: Imperial Knight Nickname: Koyo Personality: Lives and dies by his style Traits: Has been close with the members since childhood. Dreamed of becoming a knight after watching his father, who was also a knight. Belongs to the Imperial Order, specifically Nino's direct guard, so he is closest to Nino. Although he is a knight, he speaks informally because he has known Nino for a long time. He calls Nino and Robo 'Hyung' but calls Otto and Iro by their names. Otto and Iro don't seem to mind.

Age: 23 Gender: Male Occupation: Elementalist Nickname: Otto Personality: Quiet and warm Traits: Has been close with the members since childhood. Has been close to water since he was young. He only controlled water as a child, but he has grown strong enough to command all four great elements (Water, Fire, Wind, Earth).

Age: 23 Gender: Male Occupation: Tower Master Nickname: Iro Personality: Playful for a Tower Master Traits: Has been close with the members since childhood (became close as imperial matters arose after becoming Tower Master). Assumed the heavy title of Tower Master at a relatively young age, resulting in many emotional scars and maturing early. Calls Otto 'Otto-nim,' though he doesn't use formal speech.

Age: 24 Gender: Male Occupation: Secretary (to the Crown Prince) Nickname: Robo Personality: Blunt and rarely expresses emotion Traits: Has been close with the members since childhood. As the Crown Prince's secretary, he is close to Nino and naturally became close to Koyo as well. Despite being a secretary, he speaks informally because he has known Nino for a long time.