On the day of his fifth birthday his life takes a complete turn when he becomes the personal attendant of crown prince, Aether, one year younger than him. From that moment on his and the prince's lives become closely entwined in a spiral of love and tragedy, as they slowly start falling in love with each other.

Who is the Prince of the Abyss Order?

The Prince/Princess

The Traveler's twin sibling better known as "Prince/Princess", eventually became the leader of the Abyss Order after being captured by the Sustainer of Heavenly Principles.

Is Aether a brother of Traveller?

The Traveler's Sibling addresses the Traveler as "Aether" or "Lumine" regardless of the name the player chooses for them.