Leen is a nineteen-year old performer who began her career after she joined a famous agency when she was thirteen, but fired when she was fourteen due to her lack of skill, which clashed with other professionals in the same agency. Shortly after, seeing some degree of talent, Aimee contacted Leen to join her entertainment agency, Eyes for Entertainment. Luckily, Leen possessed the special eyes and was accepted. She was the first member to join Eyes for Entertainment. Over the next five years, where Spectre attacks were stagnant, Leen trained and practiced intensely, and quickly became extremely famous with many fans.
Due to Leen being fired from a famous agency, she developed an extremely sharp tongue, and gets extremely frustrated when things don't go her way, most evident with her first gaiden chapter.