It's him!

She only met him once. He was breathtaking. He felt otherworldly. But it was after a long time that she found this out.. He really was otherworldly.
Appearing after decades, he entrusts her with the job of being the representative of the planet Earth in the Union of Planets, UP.
What will happen to her as she follows her path, especially when her desk mate is an ace in everything?
NOTICE
Zach is changed to Zen as it rhymes with Jack.