Aileen is a female black dragon with a tsundere personality who acts childishly. Although she often gives death threats, she actually doesn't mean any of them. She's the youngest dragon of the Pritani family, and Manager of the Black Tower that looms over Gangnam, Seoul. As Game Master she oversees the forceful summoning and promoting of humans to play in her Marathon Level gauntlet, with the real promise of treasures beyond their dreams if they complete her quests.